Regency Fireplace Products Regency Gi29LU Quick start guide

Regency®Gi29LU
Gas Insert
Owners &
Installation Manual
www.regency-re.com
- Do not store or use gasoline or other ammable vapours and liquids in the vicinity of this or any
other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch: do not use any phone in your building.
Leave the building immediately.
• Immediately call your gas supplier from a neighbour’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the re department.
- Installation and service must be performed by a qualied installer, service agency or the gas supplier.
Warning
Fire or explosion Hazard
failure to follow safety warnings exactly could result in serious
injury, death, or property damage.
MODELS: Gi29LU-NG Natural Gas Gi29LU-LP Propane
920-391f FPI FIREPLACE PRODUCTS INTERNATIONAL LTD. 6988 Venture St., Delta, BC Canada, V4G 1H4 06.09.23
Installer: Please complete the details on the back cover and
leave this manual with the homeowner.
Homeowner: Please keep these instructions for future
reference.
Tested by:
Certied to/Certié pour : ANSI Z21.88-2019

2 | Gi29 Direct Vent Gas Insert
TO THE NEW OWNER
Congratulations! You are the owner of a state-of-the-art gas insert by Regency.
The Regency gas insert series of handcrafted appliances is designed to provide you with all the warmth and charm of a
replace at the ick of a switch. The Gi29LU is approved by Intertek for safety and eciency. As it also bears Regency’s
mark, it promises economy, comfort, and security for many trouble-free years to come.
Please take a moment to acquaint yourself with the instructions in this manual, as well as the many features of your
Regency replace.
This product can be installed in an aftermarket,
permanently located manufactured home (USA only),
or mobile home where not prohibited by local codes.
This appliance is for use with the type of gas
indicated on the rating plate only. This appliance
is not convertible for use with other gases unless a
certied kit is used.
920-408
4.34.7
Instruction Plate
For a glass-fronted gas appliance where the temperature of the glass
viewing area outside surface exceeds the limits specified in Clause 5.14.4, the following
graphic danger and statements shall be shown on a Class IIIA-2 Permanent Label.
4.34.6
Instruction Plate
Each appliance shall bear a Class IIIB marking with letters on a contrasting background, located
adjacent to the controlling device or in an equally conspicuous position where the instruction can be easily read.
April 22/14: Created draft
Double sided
Material: Synthetic Paper
Size 5.965" W x 5.71" H
Color: As shown in artwork
DANGER
HOT GLASS WILL
CAUSE BURNS
DO NOT TOUCH GLASS
UNTIL COOLED
NEVER ALLOW CHILDREN
TO TOUCH GLASS
A barrier designed to reduce the risk of burns from the hot viewing glass
is provided with this appliance and must be installed for the protection
of children and other at risk individuals.
!DANGER
!
920-408
CAUTION:
HOT WHILE IN OPERATION. DO NOT TOUCH.
SEVERE BURNS MAY RESULT. KEEP CHILDREN, CLOTHING, FURNITURE,
GASOLINE, AND ANY OTHER LIQUIDS WITH FLAMMABLE VAPOURS AWAY.
KEEP BURNER AND CONTROL COMPARTMENT CLEAN.
SEE INSTALLATION AND OPERATING INSTRUCTIONS ACCOMPANYING
APPLIANCE.
Front Back
LA SURFACE VITRÉE CHAUDE
PEUT CAUSER DES BRÛLURES.
NE TOUCHEZ PAS À LA
SURFACE VITRÉE NON REFROIDIE.
NE LAISSEZ JAMAIS UN
ENFANT TOUCHER LA SURFACE
VITRÉE.
DANGER
!
L’écran pare-étincelles fourni avec ce foyer réduit le risque de brûlure en cas de
contact accidentel avec la vitre chaude et doit être installé pour la protection des
enfants et des personnes à risque.
920-408-fr
ATTENTION
S'assurer que le brûleur et le compartiment des commandes sont propres.
Voir les instructions d’installation et d’utilisation qui accompagnent
l'appareil.
Risque de brûlures graves.
Ne pas toucher l’appareil lorsqu’il fonctionne.
Ne pas laisser les enfants s’approcher de l’appareil. Garder les
vêtements, les meubles et tout gaz ou liquide inflammable (carburant)
à distance de l'appareil.

Gi29 Direct Vent Gas Insert | 3
table of contents
Unit Dimensions ............................................................................ 4
Faceplate Dimensions .................................................................... 5
Copy of Safety Label...................................................................... 6
Know Your Appliance ..................................................................... 9
Important Message ................................................................... 10
Important Information................................................................. 10
Before You Start.......................................................................... 10
For Your Safety ........................................................................... 10
Specications.............................................................................. 10
Copy of Lighting Plate Instructions ............................................... 11
Gas Installation Checklist ............................................................... 7
Gas Pressure Testing ................................................................... 12
Installation Into a Solid Fuel Burning Fireplace or Factory Built
Fireplace................................................................................... 12
Factory-Built (Metal) Wood-Burning Fireplace Requirements ........... 12
General Safety Information .......................................................... 12
Installation Checklist.................................................................... 13
Materials Required....................................................................... 13
Minimum Fireplace Dimensions..................................................... 13
Electrical Receptacle in a Masonry Fireplace .................................. 13
Minimum Fireplace Opening Sizes with Varying Faceplate/Backing
Plate Options ............................................................................ 14
Minimum Clearances to Combustibles ........................................... 15
Mantel Clearances Without Mantel Deector & Mantel Clearances with
2-1/2" Mantel Deector ............................................................... 16
Using Steel Studs & Concrete Board Over Masonry Brick Fireplace .. 17
Leveling Legs Adjustment ............................................................ 18
Gas Connection........................................................................... 19
Vertical Venting ........................................................................... 19
Alternate Approved Vertical Termination Caps/Adaptor ................... 20
Restrictor Adjustment .................................................................. 21
Vertical Venting/Restrictor Settings for NG and LP.......................... 22
Horizontal Co-Linear Vent Kit (Masonry Fireplaces Only)................. 23
Flue Collar Installation/Removal ................................................... 24
Air Shutter Adjustment ................................................................ 25
NG System Data.......................................................................... 26
LP System Data........................................................................... 26
High Elevation............................................................................. 26
Gas Line Installation .................................................................... 26
Pilot Adjustment.......................................................................... 26
Gas Pipe Pressure Testing ............................................................ 26
820 Valve Description .................................................................. 26
Gas Shut O Procedure ............................................................... 27
Conversion from Natural Gas to Propane ...................................... 28
Derating Kit ................................................................................ 30
Panel Installation ........................................................................ 31
Birch & Oak Log Set Installation (Part #311-931 & 311-934).......... 34
Driftwood Log Set Installation (Part #311-930/P) .......................... 42
Screen Removal .......................................................................... 49
Glass Door Removal .................................................................... 50
Faceplate/Finishing Trim Installation ............................................. 51
Backing Plate Installation............................................................. 52
Mantel Deector Installation......................................................... 54
Premium Faceplate Surround Installation ...................................... 55
Traditional Faceplate Surround Install (Part #311-927, 311-928)..... 56
Hearth Trim Installation - Trimming to Height................................ 57
Hearth Trim Installation - Mounting Hearth Trim ............................ 58
Optional Wall Thermostat ............................................................ 59
Thermostat Wire Table................................................................. 59
Supplied Remote Control ............................................................. 59
Final Check ................................................................................. 59
Wiring Diagram ........................................................................... 60
Operating Instructions ................................................................ 61
Lighting Procedure ...................................................................... 61
Shutdown Procedure ................................................................... 61
First Fire..................................................................................... 61
Automatic Convection Fan Operation ............................................ 61
On/O Switch ............................................................................. 61
On/O/Pilot Extension Knob - Hi/Low Extension Knob
Fan Control Knob ........................................................................ 61
Proame I Remote Control Operating Instructions ......................... 62
Proame I Remote Receiver Battery Replacement.......................... 65
Operating Procedure for Remote Control....................................... 66
Normal Operating Sounds of Gas Appliances ................................. 67
Maintenance Instructions ............................................................. 67
Door Glass ................................................................................. 68
Glass Replacement ...................................................................... 68
General Vent Maintenance ........................................................... 68
Log Replacement ........................................................................ 68
Glass Gasket ............................................................................... 68
Sparker Battery Change............................................................... 68
Fan Replacement......................................................................... 69
Valve Replacement ...................................................................... 70
Gas Maintenance - Recommended Annual Routine......................... 72
Parts - Main Assembly ................................................................. 73
Faceplates/Accessories ................................................................ 75
Warranty ...............................................................................76
Dimensions
Installation
Owner’s Information
Installer’s Information
Operation
Maintenance
Parts

4 | Gi29 Direct Vent Gas Insert
dimensions
Unit Dimensions
O
P
E
H
D
S T
R
Q
A
G
B
F
C
M
L
N
J
I
K
Leer Descripon Dimensions
(inches)
Dimensions
(mm)
AWidth 29-3/4" 756 mm
BOuterbox Width 28-5/16" 719 mm
COuterbox Height 20-1/4" 514 mm
DOuterbox Depth 17-7/8" 454 mm
EOuterbox Rear Width 20" 508 mm
F Front to Top Taper 8-3/8" 213 mm
G Front to Side Taper 3-13/16" 97 mm
H Rear to Side Taper 14-1/16" 357 mm
I Gas Inlet Height 1-1/4" 32 mm
J Gas Inlet Rear Depth 5-1/2" 140 mm
Leer Descripon Dimensions
(inches)
Dimensions
(mm)
K Gas Inlet Front Depth 12-7/16" 316 mm
LElectrical Access Height 1-1/8" 29 mm
MElectrical Access Rear Depth 7-1/2" 191 mm
NElectrical Access Front Depth 10-3/8" 264 mm
OGlass Viewing Area Width 24-1/8" 613 mm
PGlass Viewing Area Height 15" 381 mm
QFront to Intake 15-1/16" 383 mm
RFront to Exhaust 14" 356 mm
SIntake Diameter 3" 76 mm
TExhaust Diameter 3" 76 mm

Gi29 Direct Vent Gas Insert | 5
dimensions
A
B
C
D
Faceplate
Dimensions
Width
(A)
Height
(B)
Depth
(C)
Boom Height
(D)
Regular Faceplate 40-3/16" (1021 mm) 26" (660 mm) 1-1/4" (32 mm) -
Regular Faceplate w/ Pre-
mium Surround
40-13/16" (1021 mm) 26-3/8" (670 mm) 1-11/16" (43
mm)
-
Flush Faceplate 40-3/16" (1021 mm) 26" (660 mm) 1/8" (3 mm) -
Flush Faceplate w/Traditional
Surround
45-3/4" (1162 mm) 28-3/4" (730 mm) 2-1/4" (57 mm)
4-Sided Flush Faceplate 40-3/16" (1021 mm) 29-1/4" (743 mm) 1/8" (3 mm) 4-3/16" (106 mm)
Finishing Trim 31-7/8" (810 mm) 21-7/8" (556 mm) 1/16" (2 mm) -
4-Sided Finishing Trim 31-7/8" (810 mm) 23-1/8" (587 mm) 1/16" (2 mm) 1-1/8" (29 mm)
Oversized Backing Plate 47-1/2" (1207 mm) 31-1/2" (800 mm) 1/8" (3 mm) -
3-Sided Custom Backing Plate 33-7/8" - 56-7/8"
(860 mm - 1445 mm)
22-7/8" - 44-7/8"
(581 mm - 1118 mm)
1/8" (3 mm) -
4-Sided Custom Backing Plate 33-7/8" - 69"
(860 mm - 1753 mm)
25-1/8" - 45"
(638 mm - 1143 mm)
1/8" (3 mm) 2-1/8" minimum (54 mm min.)
B
A
C
Faceplate Dimensions
Three-Sided Faceplate
Four-Sided Faceplate

6 | Gi29 Direct Vent Gas Insert
owner's information
A copy of the label that accompanies each Gi29LU gas insert is below.
For the State of Massachusetts, installation and repair must be
done by a plumber or gas tter licensed in the Commonwealth
of Massachusetts.
For the State of Massachusetts, exible connectors shall not
exceed 36 inches in length.
For the State of Massachusetts, the appliance’s individual manual
shuto must be a t-handle type valve.
The State of Massachusetts requires the installation of a carbon
monoxide alarm in accordance with NFPA 720 and a CO alarm
with battery backup in the same room where the gas appliance
is installed.
Copy of Safety Label
To nd the safety label, remove faceplate from the front of your unit (see manual);
the safety label is located below the glass (see picture).
DO NOT REMOVE THE LABEL FROM THE UNIT.
NATURAL GAS FIREPLACE INSERT: MODEL Gi29LU-NG
Factory Equipped For Altitude 0-4500ft. (0-1370m)
Min. Supply Pressure 5" WC (1.25 kPa)
Low Setting Man. Pressure 1.1" WC (0.27 kPa)
Max. Manifold pressure 3.8" WC (0.95 kPa)
Factory Equipped for Altitude 0-2,000ft (0-610m)
Orifice #38 DMS
Minimum input 17,000 Btu/h (4.98 kW)
Maximum input 31,500 Btu/h (9.22 kW)
Field Convertible for Altitude 2,000 - 4,500ft (610m-1370m) - Use Conversion Kit #311-980
Orifice #39 DMS
Minimum Input 16,500 Btu/h (4.83 kW)
Maximum Input 30,500 Btu/h (8.93 kW)
PROPANE GAS FIREPLACE INSERT: MODEL Gi29LU-LP
Factory Equipped For Altitude 0-4500ft. (0-1370m)
Min. Supply Pressure 11" WC (2.74 kPa)
Low Setting Man. Pressure 2.9" WC (0.72 kPa)
Max. Manifold Pressure 10.5" WC (2.61 kPa)
Orifice #52 DMS
Minimum Input 17,000 Btu/h (4.98 kW)
Maximum Input 31,500 Btu/h (9.22 kW)
Model: Gi29LU-NG
920-428b
Part #: 920-428b
Colour: Black on grey except what is highlighted is printed red
Size: (File at 100%) 6.495"W x 8.66" H
Material: 2 ml silver matt polyester (DPM SMS)
Sept 30/2021: Created draft
Feb. 16/22: Added “Category 1” and changed barrier and fan part numbers.
DO NOT REMOVE THIS LABEL
Serial No.
565
Duplicate Serial Number
Listed: VENTED GAS FIREPLACE HEATER
Certified to:
ANSI Z21.88-2019
VENTED GAS FIREPLACE HEATER - NOT FOR USE WITH SOLID FUELS.
Model Gi29LU-LP
Mantel Clearances
FPI Fireplace Products International, Ltd
Delta BC, CANADA MADE IN CANADA /FABRIQUÉ AU CANADA
Minimum Clearances to Combustibles
from Insert
This appliance must be installed in accordance with local codes, if any; if none, follow the National Fuel Gas Code, ANSI Z223.1.
This appliance is only for use with the type of gas indicated on the rating plate.
This appliance is not convertible for use with other gases unless a certified kit is used.
This appliance is only for use with the type of gas indicated on the rating plate and may be installed in an aftermarket, permanently located, manufactured
(mobile) home where not prohibited by local codes. See owner's manual for details
WARNING. This fireplace has been converted for use with a gas fireplace insert only and cannot be used for burning wood or solid fuels unless all original
parts have been replaced, and the fireplace re-approved by the authority having jurisdiction.
This vented gas fireplace heater is not for use with air filters.
For use with glass doors certified with the appliance only.
For use only with barrier (Part # 311-417/P). Follow installation instructions.
C # 4001172
Electrical supply 115VAC, Less than 1A, 60Hz, Fan Part # 911-071/P CATEGORY 1
A
C
B
E
K
D
L
G
Refer to Intertek's Directory of Building Products for detailed information.
565
Side wall A 8” (203 mm)
Ceiling B 63.75” (1873 mm)
Mantel C 41.5” (1055 mm)
Min. Alcove Width K 54” (1372 mm)
Max. Alcove Depth L 36” (914 mm)
Min. Hearth Depth D 12” (305 mm)
Min. Hearth Width E 36” (914 mm)
Max. Mantle Depth G 12” (305 mm)
Gi29LU Serial Label
NOTE
Regency units are constantly improving. Check the safety
label on the unit and if it is dierent from the copy provided
here, the label on the unit is correct.
Safety label location
With the pilot on, turn the switch to the right to turn the burner
on. Moving the switch to the left will turn the burner o.
On/O Switch
NOTE
This ON/OFF switch will be located on the lower left-hand
side of the appliance as shown above.

Gi29 Direct Vent Gas Insert | 7
dimensions
05/18/21
1
REGENCY GAS INSTALLATION CHECKLIST
Customer: Date Installed:
Install Address: Location of Fireplace:
Serial No: Installer:
Model No:
Site Requirements YES NO
If applicable, are the insulation, vapour barrier, and drywall present if installed on an outside wall or chase?
Does the area have a solid continuous base to support the unit?
Will the area accommodate the size of the applliance and all clearances?
Are the gas and electrical roughed into the area where the unit is being installed?
In City & Grandview series cool wall applications, is the chase enclosure sealed to prevent heat from escaping? All hot air
from the unit must exit via the mandatory ventilation openings.
In City & Grandview applications, Is the chase enclosure vented with the mandatory heat ventilation openings? See manual
for details.
If applicable, is the masonry/factory built freplace in its original condition with no modifications?
If applicable, have the hearth requirements been met?
Unit Setup YES NO
If applicable, are the standoffs and top nailing flange extensions installed and at the correct depth to accommodate finishing
material? See manual for details.
If applicable, is the fireplace level and secured, meeting framing clearances? See manual for details.
If applicable, is the unit converted to top or rear vent per manual instructions, and the insulation discarded?
Venting YES NO
Are the venting components approved for the unit installed?
Does the venting configuration comply with venting diagrams?
Is venting installed and secured, and are clearances for the vent pipe and termination cap maintained?
If applicable, was a 1/4" rise maintained for every foot of horizontal run?
Was the termination installed and sealed?
Is the direct vent termination at the highest point in the vent assembly?
If applicable, are both chimney liners continuous from flue collars to termination?
Electrical and Wiring YES NO
Is the appliance connected to the household's 110/120v per local codes? Check local codes for receptacle placement.
Were the connections in the fireplace tested with a circuit tester?
Is the appliance properly grounded?
If applicable, is the supplied electrical/gang box affixed to the wall to facilitate the mounting of the receiver/battery box ?
Gas YES NO
Does the supply pressure meet the requirements shown on the rating plate?
Was a conversion performed?
Was a leak check performed and manifold pressures verified?
Is the shut-off valve installed and easily accessible to the customer?
This general checklist does not contain all pertinent installation details or specifics and does not supersede the guidelines in this manual. Your
Regency dealer/installer should use it in conjunction with manual instructions. Please follow all local codes and jurisdictions in authority.
Gas Installation Checklist

8 | Gi29 Direct Vent Gas Insert
installation
05/18/21
2
REGENCY GAS INSTALLATION CHECKLIST
Finishing YES NO
If applicable, is only noncombustible material installed in the noncombustible areas?
Do clearances meet installation and manual requirements?
Do the mantels and/or projections comply with the installation manual?
If applicable, was the solid fuel fireplace warning plate installed?
Appliance Media Setup YES NO
Do commands from the remote or wall switch light the pilot and main burner?
Are the burner media/log set, glass door, and screen installed per instructions in the manual?
Was the air shutter on the proper setting after running the unit for 20 minutes?
If applicable, were the surround and trims installed according to the manual?
Was the operation of the fan, lights (if installed), and flame modulation checked?
Customer Tutorial and Presentation YES NO
Is the customer confident operating the new gas appliance and aware of all the features on the remote?
Confirm that the rating and lighting plates are attached to the appliance. Do not remove.
Was the customer informed of the location of the rating and lighting plates?
Was accessing unit controls in a power outage explained to the customer?
Are the model and serial numbers and the date of installation of the unit written in the manual and on the checklist?
Were the warranty and unit registration reviewed with the customer?
Comments:

Gi29 Direct Vent Gas Insert | 9
owner's information
D
BEFG
C
J
HI
A
Know Your Appliance
LETTER DESCRIPTION MORE INFO ON PAGE
ASCREEN 49
B ON/OFF SWITCH 60
CGLASS DOOR 50
DSPARKER BATTERY LOCATION 67
EGAS SHUT-OFF VALVE 27
F PILOT/ON/OFF CONTROL KNOB 60
GFLAME ADJUSTMENT KNOB 60
HFAN ADJUSTMENT KNOB 60
IAIR SHUTTER ADJUSTMENT ARM 25
JREMOTE BATTERY LOCATION 64

10 | Gi29 Direct Vent Gas Insert
owner's information
Important Message
SAVE THESE INSTRUCTIONS
The Gi29LU gas insert must be installed in
accordance with the instructions in this manual; read
them carefully before installing the unit. Consult
the authority having jurisdiction to determine the
need for permits prior to starting the installation.
It is the responsibility of the installer to ensure
this replace is installed in compliance with the
manufacturer’s instructions and all applicable codes.
Important Information
Model Gi29LU standing pilot (approved for use in
the USA only) is a millivolt system tted with a
pilot that stays lit 24/7, 365 days of the year. As
long as the pilot is lit, it will remain on until it is
turned o. This system is not approved for sale in
Canada due to requirements associated with the
seven-day timer.
Before You Start
We are required by the Canadian Safety Standards
and ANSI Standards to make you aware of the
following.
CLOTHING OR OTHER FLAMMABLE
MATERIAL SHOULD NOT BE PLACED
ON OR NEAR THE APPLIANCE.
CHILDREN AND ADULTS SHOULD BE
ALERTED TO THE HAZARDS OF HIGH
SURFACE TEMPERATURES, ESPE-
CIALLY THE FIREPLACE GLASS, AND
SHOULD STAY AWAY TO AVOID BURNS
OR CLOTHING IGNITION.
INSTALLATION AND REPAIR SHOULD
BE DONE BY AN AUTHORIZED SERVICE
PERSON. THE APPLIANCE SHOULD
BE INSPECTED BEFORE USE AND AT
LEAST ANNUALLY BY A PROFESSIONAL
SERVICE PERSON. MORE FREQUENT
CLEANING MAY BE REQUIRED DUE
TO LINT FROM CARPETING, BEDDING
MATERIAL, ETC. IT IS IMPERATIVE
THAT CONTROL COMPARTMENTS,
BURNERS, AND CIRCULATING AIR
PASSAGEWAYS OF THE APPLIANCE
ARE KEPT CLEAN.
DUE TO HIGH TEMPERATURES, THE
APPLIANCE SHOULD BE LOCATED
OUT OF TRAFFIC AND AWAY FROM
FURNITURE AND DRAPERIES.
WARNING: FAILURE TO INSTALL THIS
APPLIANCE CORRECTLY WILL VOID
YOUR WARRANTY AND MAY CAUSE
A SERIOUS HOUSE FIRE.
A BARRIER DESIGNED TO REDUCE
THE RISK OF BURNS FROM THE HOT
VIEWING GLASS IS PROVIDED WITH
THIS APPLIANCE AND SHALL BE
INSTALLED FOR THE PROTECTION
OF CHILDREN AND OTHER AT-RISK
INDIVIDUALS
IF THE BARRIER BECOMES DAMAGED,
IT MUST BE REPLACED WITH THE
MANUFACTURER’S BARRIER FOR
THIS APPLIANCE.
ANY SAFETY SCREEN, GUARD, OR
BARRIER REMOVED FOR SERVICING
AN APPLIANCE MUST BE REPLACED
PRIOR TO OPERATING THE
APPLIANCE.
For Your Safety
This appliance requires air for proper combustion.
Always provide adequate combustion and ventilation
air. Follow instructions and information in CSA
B149.1 (in Canada) or the National Fuel Gas Code
ANSI Z223.1 (in the USA), regarding requirements
for combustion and ventilation air.
Specications
At pressures over 1/2 psig, the pipe to the unit
must be disconnected.
Gas Max. Input Capacity:
Natural Gas 31,500 Btu/h (0-2000 ft../0-610 m)
30,500 Btu/h
(2,000-4,000 ft./610-1,370 m)
Propane 31,500 Btu/h
Min. Input
Natural Gas 17,000 Btu/h (0-2,000 ft../0-610 m)
16,500 Btu/h
(2,000-4,000 ft./610-1,370 m)
Propane 17,000 Btu/h
Fuels: Approved for use with natural gas and
propane. Approved at-is for use at 0' to 4,500'
(0-1,370 m).
Electrical: 120 V A.C. system.
Circulation Fan: Variable speed, 140 CFM.
Log Set: Ceramic bre, 10 per set
Glass Crystals: 2-1/2 pounds of crushed glass
Vent System: 3" (76 mm) co-linear aluminum ex
(intake & exhaust). The unit’s thermal eciency
rating is determined under continuous operating
conditions, independent of any installed system.