Sherwood Industries Enviro M55-FS-2 User manual

11785 SE Highway 212 –Suite 305
Clackamas, OR 97015-9050
[phone]
WWW.PFSTECO.COM
Sherwood Industries
Ltd.
Project # 21-703
Model: Enviro M55-FS-2
AKA: Enviro M55C-FS-2
Enviro M55C-FPI-2
FPI GC60-2
FPI GCI60-2
Type: Pellet-Fired Heater, Freestanding
or Insert
September 15, 2021
ASTM E2779 Standard Test Method for
Determining Particulate Matter Emissions
from Pellet Heaters
Contact: Garrett Posehn
Sherwood Industries Ltd.
6782 Oldfield Rd.
Victoria, BC Canada
V8M 2A3
250-652-6080
Prepared by: Aaron Kravitz

Project # 21-703 Model: M55-FS-2
Page | 1
Contents
Affidavit .........................................................................................................................................................................2
Introduction...................................................................................................................................................................3
Notes.........................................................................................................................................................................3
Pellet Heater Identification and Testing........................................................................................................................4
Test Procedures and Equipment ...................................................................................................................................5
Results ...........................................................................................................................................................................6
Summary Table..........................................................................................................................................................6
Test Run Narrative.....................................................................................................................................................6
Run 1.....................................................................................................................................................................6
Test Conditions Summary..............................................................................................................................................6
Appliance Operation and Test Settings .....................................................................................................................7
Settings & Run Notes ................................................................................................................................................7
Appliance Description....................................................................................................................................................8
Appliance Dimensions...............................................................................................................................................8
Test Fuel Properties.....................................................................................................................................................11
Pellet Fuel Analysis..................................................................................................................................................12
Sampling Locations and Descriptions ..........................................................................................................................13
Sample Points..........................................................................................................................................................13
Sampling Methods.......................................................................................................................................................14
Analytical Methods Description ..................................................................................................................................14
Calibration, Quality Control and Assurances...............................................................................................................14
Appliance Sealing and Storage ....................................................................................................................................14
Sealing Label............................................................................................................................................................14
Sealed Unit ..............................................................................................................................................................15
List of Appendices........................................................................................................................................................16

Project # 21-703 Model: M55-FS-2
Page | 2
Affidavit
PFS-TECO was contracted by Sherwood Industries Ltd. to provide testing services for
the Enviro M55-FS-2 Pellet-Fired Fireplace Insert per ASTM E2779, Determining PM
Emissions from Pellet Heaters. All testing and associated procedures were conducted at
PFS-TECO’s Portland Laboratory on 7/29/2021. PFS-TECO’s Portland Laboratory is
located at 11785 SE Highway 212 –Suite 305, Clackamas, Oregon 97015. Testing
procedures followed ASTM E2779. Particulate sampling was performed per ASTM
E2515, Standard Test Method for Determination of Particulate Matter Emissions
Collected by a Dilution Tunnel.
PFS-TECO is accredited by the U.S. Environmental Protection Agency for the certification
and auditing of wood heaters pursuant to subpart AAA of 40 CFR Part 60, New Source
Performance Standards for Residential Wood Heaters and subpart QQQQ of 40 CFR
Part 60, Standards of Performance for New Hydronic Heaters and Forced Air Furnaces,
Methods 28R, 28WHH, 28 WHH-PTS, and all methods listed in Sections 60.534 and
60.5476. PFS-TECO holds EPA Accreditation Certificate Numbers 4 and 4M (mobile).
PFS-TECO is accredited by IAS to ISO 17020:2012 “Criteria for Bodies Performing
Inspections”, and ISO 17025:2005 “Requirements for Testing Laboratories.” PFS-TECO
is also accredited by Standards Council of Canada to ISO 17065:2012 “Requirements for
Bodies Operating Product Certification Systems.”
The following people were associated with the testing, analysis and report writing
associated with this project.
Aaron Kravitz, Testing Supervisor

Project # 21-703 Model: M55-FS-2
Page | 3
Introduction
Sherwood Industries Ltd. of Victoria, BC, contracted with PFS-TECO to perform EPA
certification testing on the Enviro M55-FS-2 Pellet-Fired Room Heater. All testing was
performed at PFS-TECO’s Portland Laboratory.Testing was performed by Mr. Aaron
Kravitz.
Notes
•Prior to start of testing, 50 hours of conditioning was performed by the
manufacturer at a medium burn setting, in accordance with ASTM E2779.
•Prior to start of testing, the dilution tunnel was cleaned with a steel brush.
•Front filters were changed on sample train A at one hour after the test began.
•A single, integrated test run, in accordance with ASTM E2779 was performed:
o1 Hour at Maximum Burn Setting
o2 Hours at Medium Burn Setting (Defined as <50% of Maximum Burn Rate)
o3 Hours at Minimum Burn Setting

Project # 21-703 Model: M55-FS-2
Page | 4
Pellet Heater Identification and Testing
•Appliance Tested: Enviro M55-FS-2
•Serial Number: N/A –Prototype Unit; PFS Tracking Number 0096
•Manufacturer: Sherwood Industries Ltd.
•Catalyst: No
•Heat exchange blower: Integral
•Type: Pellet Stove
•Style: Free Standing
•Date Received: Thursday, July 29, 2021
•Testing Period –Start: Thursday, July 29, 2021 Finish: Thursday, July 29,
2021
•Test Location: PFS-TECO Portland Laboratory, 11785 SE HWY 212 - Suite
305, Clackamas, OR 97015
•Elevation: ≈131 Feet above sea level
•Test Technician(s): Aaron Kravitz
•Observers: Mr. Winslow Howe

Project # 21-703 Model: M55-FS-2
Page | 5
Test Procedures and Equipment
All Sampling and analytical procedures were performed by Aaron Kravitz. All procedures
used are directly from ASTM E2779 and ASTM E2515. See the list below for equipment
used. See Appendix C submitted with this report for calibration data.
Equipment List:
Equipment ID#
Equipment Description
053
APEX XC-60 Digital Emissions Sampling Box A
054
APEX XC-60 Digital Emissions Sampling Box B
055
APEX Ambient sampling box
057
California Analytical ZRE CO2/CO/O2 IR ANALYZER
064
Digital Barometer
109A/B
Troemner 100mg/200mg Audit Weights
107
Sartorius Analytical Balance
097
10 lb audit weight
095
Anemometer
111
Microtector
190
Mettler Toledo 1000 x 0.02lb platform scale
92302052
Gas Analyzer Calibration Span Gas
91005049
Gas Analyzer Calibration Mid Gas

Project # 21-703 Model: M55-FS-2
Page | 6
Results
The integrated test run emission rate for test Run 1 was measured to be 1.9 g/hr with a
Higher Heating Values efficiency of 78% and a CO emission rate of 0.4 g/min. The
calculated first hour particulate emission rate was 6.4 g/hr. The Sherwood Industries Ltd.
Model Enviro M55-FS-2 Pellet-Fired Room Heater meets the 2020 PM emission standard
of ≤ 2.0 g/hr per CFR 40 part 60, §60.532 (b).
Detailed individual run data can be found in Appendix A submitted with this report.
Summary Table
EPA Application Table
Run
#
Date
Segment/
Setting
BR
(kg/hr)
Run
Time
(min)
Heat
Output
(BTU/hr)
1st Hr
Emissions
(g/hr)
Overall
Emissions
(g/hr)
CO
Emissions
(g/min)
Overall
CO
Emissions
(g/min)
Heating
Efficiency
(%HHV)
Overall
Heating
Efficiency
(%HHV)
1
7/29/21
H
2.54
60
38437
6.44
1.9
1.24
0.4
78.6%
78%
M
1.15
120
16911
0.25
76.8%
L
0.52
180
7817
0.20
77.6%
OA
1.07
360
16060
0.38
78.2%
Test Run Narrative
Run 1
Run 1 was performed on 7/29/2021 as anattempted integrated test run per ASTM E2779.
The overall test duration was 360 minutes. The particulate emissions rate for the
integrated test run was 1.9 g/hr. The run had an overall HHV efficiency of 78%. The train
A front filter was changed at 1 hr. All test results were appropriate and valid and the burn
rate requirement for the integrated test run were achieved. There were no anomalies and
all criteria were met.
Test Conditions Summary
Testing conditions for all runs fell within allowable specifications of ASTM E2779 and
ASTM E2515. A summary of facility conditions, fuel burned, and run times is listed below.
Runs
Ambient (°F)
Relative Humidity
(%)
Average
Barometric
Pressure (In.
Hg.)
Preburn Fuel
Weight (lbs)
Test Fuel
Weight
(lbs)
Test Fuel
Moisture
(%DB)
Test Run
Time (Min)
Pre
Post
Pre
Post
1
77
83
40.0
19.4
30.00
5.9
14.7
4.16
360

Project # 21-703 Model: M55-FS-2
Page | 7
Appliance Operation and Test Settings
The appliance was operated according to procedures as described in the Operations
Manual, found in Appendix B submitted with this report. Detailed run information can be
found in Appendix A submitted with this report.
Settings & Run Notes
Pre-Burn
Test Run
Run 1
Heat setting 5 (max),
Feed trim 5 (max),
Combustion trim* 1
High Segment: Heat Setting 5, Feed
trim 5, combustion trim 1
Medium Segment: Heat Setting 2,
Feed trim 3, Combustion trim 1
Low Segment: Heat Setting 1 (min),
Feed trim 1 (min), Combustion trim 1
*Combustion trim setting does not affect burn rate

Project # 21-703 Model: M55-FS-2
Page | 8
Appliance Description
Model(s): Enviro M55-FS-2
Enviro M55C-FS-2
Enviro M55C-FPI-2
FPI GC60-2
FPI GCI60-2
Additional Models Discussion: The M55-FS-2 is available in three variants: the basic
model (M55-FS-2), a version with decorative cast iron trim (M55C-FS-2), and a fireplace
insert version (M55C-FPI-2). These differences between these models are cosmetic only
and do not affect emissions performance; all k-list items are shared between the three
variants.
Two additional models are available (Fireplace Products International GC60-2 and
GCI60-2), which are marketing designations only and are in all respects identical to the
M55-FS-2 and M55C-FPI-2, respectively.
Appliance Type: Pellet-Fired Heater, Freestanding or Fireplace Insert
Air Introduction System: Airenters the burn chamber by being pulled though the firepot,
via the exhaust blower, see air flow diagram in Appendix D.
Combustion Control: Feed rate is electronically controlled via user-selectable controls.
Baffles: N/A
Flue Outlet: 3-inch exhaust outlet located on the rear of the appliance.
Appliance Dimensions
Enviro M55-FS-2 Dimensions
Height
Width
Depth
Firebox Volume
Weight
36 ½”
24”
29”
N/A –Pellet
Stove
315 lbs
Appliance design drawings can be found in Appendix D submitted with the CBI copy of
this report.

Project # 21-703 Model: M55-FS-2
Page | 9
Appliance Front
Appliance Left

Project # 21-703 Model: M55-FS-2
Page | 10
Appliance Right
Appliance Rear

Project # 21-703 Model: M55-FS-2
Page | 11
Test Fuel Properties
Test fuel used was Lignetics Wood Pellet Fuel, a PFI Certified Premium Pellet Brand. A
sample of pellets was sent to Twin Ports Testing for analysis, see report below.

Project # 21-703 Model: M55-FS-2
Page | 12
Pellet Fuel Analysis

Project # 21-703 Model: M55-FS-2
Page | 13
Sampling Locations and Descriptions
Sample ports are located 16.5 feet downstream from any disturbances and 1 foot
upstream from any disturbances. Flow rate traverse data was collected 12 feet
downstream from any disturbances and 5.5 feet upstream from any disturbances. (See
below).
Sample Points

Project # 21-703 Model: M55-FS-2
Page | 14
Sampling Methods
ASTM E2515 was used in collecting particulate samples. The dilution tunnel is 6 inches
in diameter. All sampling conditions per ASTM E2515 were followed. No alternate
procedures were used.
Analytical Methods Description
All sample recovery and analysis procedures followed ASTM E2515 procedures. At the
end of each test run, filters, O-Rings and probes were removed from their housings,
dessicated for a minimum of 24 hours, and then weighed at 6 hour intervals to a
constant weight per ASTM E2515-11 Section 10.
Calibration, Quality Control and Assurances
Calibration procedures and results were conducted per EPA Method 28R, ASTM E2515-
11 and ASTM E2780-10. Test method quality control procedures (leak checks, volume
meter checks, stratification checks, proportionality results) followed the procedures
outlined.
Appliance Sealing and Storage
Upon completion of testing, the appliance was secured with metal strapping and the seal
below was applied, the appliance was then returned to the manufacturer’s location at:
6782 Oldfield Rd. Victoria, BC Canada V8M 2A3 for archival.
Sealing Label

Project # 21-703 Model: M55-FS-2
Page | 15
Sealed Unit

Project # 21-703 Model: M55-FS-2
Page | 16
List of Appendices
The following appendices have been submitted electronically in conjunction with this
report:
Appendix A –Test Run Data, Technician Notes, and Sample Analysis
Appendix B –Labels and Manuals
Appendix C –Equipment Calibration Records
Appendix D –Design Drawings (CBI Report Only)
Appendix E –Manufacturer QAP (CBI Report Only)

Conditioning Data.xlsm
Client: Job #:
Model: Tracking #:
Date(s): Technician:
Elapsed Time
(hrs)
Flue (°F)
Catalyst Exit
(°F)
Scale (lb)
Weight
Change(lbs)
0 207.5 N/A 417.58 - All conditioning conducted at medium settings:
1 204.1 N/A 414.96 -2.62
2 202.8 N/A 412.87 -2.10
3 219.8 N/A 410.45 -2.41
4 218.9 N/A 408.14 -2.31
5 207.0 N/A 405.96 -2.18
6 209.2 N/A 444.17 38.21
7 213.4 N/A 442.09 -2.08
8 211.5 N/A 439.78 -2.31
9 215.2 N/A 437.60 -2.18
10 208.8 N/A 435.39 -2.21
11 203.2 N/A 433.19 -2.20
12 207.3 N/A 431.01 -2.18
13 201.8 N/A 428.80 -2.21
14 200.3 N/A 426.62 -2.18
15 204.4 N/A 424.41 -2.21
16 194.4 N/A 422.22 -2.18
17 203.4 N/A 420.01 -2.21
18 207.0 N/A 417.72 -2.29
19 210.2 N/A 415.20 -2.52
20 211.3 N/A 412.80 -2.40
21 218.3 N/A 410.27 -2.52
22 216.8 N/A 447.97 37.69
23 219.1 N/A 445.55 -2.42
24 217.7 N/A 443.15 -2.39
25 221.0 N/A 440.84 -2.32
26 219.4 N/A 438.45 -2.39
27 220.2 N/A 436.04 -2.41
28 209.8 N/A 433.86 -2.18
29 219.9 N/A 431.46 -2.40
30 208.1 N/A 429.15 -2.31
31 215.9 N/A 426.97 -2.18
32 204.0 N/A 424.77 -2.21
33 208.2 N/A 422.59 -2.18
34 200.9 N/A 420.39 -2.21
35 195.2 N/A 418.30 -2.08
36 196.0 N/A 416.20 -2.11
37 194.3 N/A 414.12 -2.08
38 191.5 N/A 412.01 -2.11
39 193.5 N/A 452.43 40.42
40 196.5 N/A 450.27 -2.16
41 199.8 N/A 448.12 -2.15
42 207.3 N/A 445.87 -2.25
43 214.9 N/A 443.42 -2.45
44 211.0 N/A 441.18 -2.24
45 222.1 N/A 438.75 -2.43
46 219.2 N/A 436.12 -2.63
47 218.4 N/A 433.79 -2.33
48 218.7 N/A 431.53 -2.26
49 221.4 N/A 429.31 -2.22
50 222.7 N/A 427.06 -2.25
Added 40 lbs of Lignetics Premium pellets, 4%DB moisture
CWH
4/27/21 - 4/29/21
91
Sherwood
21-703
M55
Notes: Indicate all air settings or adjustments, and all fuel
addition weights and moistures
Heat 3, Fuel trim 2, Combustion Trim 1
Added 40 lbs of Lignetics Premium pellets, 4%DB moisture
Added 40 lbs of Lignetics Premium pellets, 4%DB moisture
Pre-Conditioning Data
PFS-TECO Page 1 of 1
Signature/Date:___________________________8/17/2021

Run 1 Emissions.xlsm
Client
Model:
Tracking #:
Run:
PMF – Average particulate emission factor for full integrated test run, g/dry kg of fuel burned
Qsd – Average gas flow rate in dilution tunnel, dscf/hr
Vm(std) – Volume of Gas Sampled Corrected to Dry Standard Conditions, dscf
mn – Total Particulate Matter Collected, mg
Cs- Concentration of particulate matter in tunnel gas, dry basis, corrected to STP, g/dscf
ET – Total Particulate Emissions, g
BR – Average dry burn rate over full integrated test run, kg/hr
BRSi – Average dry burn rate over test run segment i, kg/hr
Vs – Average gas velocity in the dilution tunnel, ft/sec
PR - Proportional Rate Variation
PMR – Average particulate emissions for full integrated test run, g/hr
1
0091
MBdb – Weight of test fuel burned during test run, dry basis, kg
MBSidb – Weight of test fuel burned during test run segment i, dry basis, kg
Sherwood
M55
Equations and Sample Calculations – ASTM E2779 & E2515
Equations used to calculate the parameters listed below are described in this appendix. Sample
calculations are provided for each equation. The raw data and printout results from a sample run are
also provided for comparison to the sample calculations.
PFS-TECO Page 1 of 14

Run 1 Emissions.xlsm
MBdb – Weight of test fuel burned during test run, dry basis, kg
ASTM E2779 equation (1)
MBdb = (MSwb - MEwb)(100/(100 + FM))
Where, FM = average fuel moisture of test fuel, % dry basis
MSwb = weight of test fuel in hopper at start of test run, wet basis, kg
MEwb = weight of test fuel in hopper at end of test run, wet basis, kg
Sample Calculation:
FM = 4.16 %
MSwb =14.7 lbs
MEwb = 0.0 lbs
0.4536 = Conversion factor from lbs to kg
MBdb = [( 14.7 x 0.4536) - ( 0.0 x 0.4536)] (100/(100 + 4.156 )
MBdb =6.41 kg
PFS-TECO Page 2 of 14