Precision Air Lami-Vent Instruction manual

©2018, Precision Air. All rights reserved. Subject to change without notice. Form #4-199, effective 10/2018.
www.precisionairproducts.com
7620 West 78th Street, Bloomington, MN 55439 ● Phone [phone] ● Fax [phone]
INSTALLATION
OPERATION & MAINTENANCE
MANUAL
FOR
LAMI-VENTTM
LAMINAR FLOW DIFFUSERS

Lami-Vent™
Laminar Flow Diffuser
INSTALLATION, OPERATION & MAINTENANCE
©2018, Precision Air. Subject to change without notice.
1-800-404-0931
Form 04-199, effective 10/2018, Page1 of 3 www.precisionairproducts.com
STEP 1: INSTALL SUPPLY DUCTWORK PRIOR TO ERECTING CEILING.
STEP 2:
Diffuser Installation
1. Install plaster frame into ceiling opening per framing installation instructions.
2. Insert diffuser and lower onto gasketed opening.
NOTE: If additional support is required, diffuser mounted hanging tabs may be utilized.
3. Connect the supply ductwork to the top inlet collar.
NOTE: It is imperative that the connection be fully sealed to avoid leaks in the interstitial space.
4. Position the diffuser in the frame with an even reveal to ensure proper gasket coverage and a
consistent room-side appearance.
NOTE: The photos below depict PAP framing. Other framing may result in a different reveal.
Diffuser positioned
crooked & uneven
in the frame.
NON-Conformance
Conformance

©2018, Precision Air. Subject to change without notice.
1-800-404-0931
Form 04-199, effective 10/2018, Page 2 of 3 www.precisionairproducts.com
STEP 3: CONNECT SUPPLY DUCTWORK TO TOP INLET COLLAR
Connect supply ductwork to top inlet collar as required by project specifications if connection has not
been made prior to suspending the diffuser from above. Place the diffuser into ceiling framing after
inlet connection has been installed.
STEP 4:PREPARATION FOR BALANCING
a. Drop the perforated faceplates on diffusers by loosening all quarter-turn fasteners located
on the perimeter of faceplate by turning fastener counterclockwise with slot screwdriver.
Carefully disconnect the single safety cable and allow the faceplate to hang freely by two of
the safety cables on the opposite side.
Note: Each diffuser has at least three safety cables that connect the faceplate to the
plenum to prevent accidental dropping, two cables on one side and one on the opposite
side. Simply disconnect the single cable and then re-hook after the filter is installed.
b. Confirm that air-handling system has been blown down in order to eliminate dirt and debris
that may have accumulated in the ductwork during the construction process. If this has not
yet been completed, run the air handler on high for several minutes.
c. Clean and dry the inside of each diffuser and both sides of perforated faceplate with a towel and
a non-abrasive cleaner.
d. Inspect that the entire framing system is gasketed to assure an airtight interface between
the framing and diffuser (and any blank-off/fill-in panels or fluorescent light fixtures also
installed in the framing system).
STEP 5: BALANCING
The Lami-Vent's self-contained module design allows for adjustment of airflow from the room side of
the diffuser. Please follow the outlined procedure below for proper balancing of an entire system of
diffusers. If specific air volumes for diffusers are indicated on mechanical drawings for the room,
balance diffusers to specified air volumes.
a. Prior to any adjustment, check each individual diffuser for total CFM output with a flow
hood. The diffuser’s internal volume adjustment valve is meant for fine-tuning only. If
rough balancing is required, please adjust by the valve located within the supply
ductwork before attempting to adjust the internal balancing valve, otherwise noise
problems could result from restricting the inlet and increasing air velocity.
b. The single metering damper (cone valve) located
below the inlet collar can be adjusted from the room
side of the diffuser with an 8-10" straight blade
screwdriver by simply dropping the faceplate and
accessing the adjustment screw through a hole in the
diffuser’s centerplate.

©2018, Precision Air. Subject to change without notice.
1-800-404-0931
Form 04-199, effective 10/2018, Page 3 of 3 www.precisionairproducts.com
If the diffuser’s faceplate has the optional “plug button”,
the faceplate need not be dropped and the plug simply
should be removed to gain access to the adjustment
screw. If balancing a unit with a side or end inlet, the
adjustment screw is located along the perimeter of the
diffuser frame on the side or end, just below the side or
end inlet.
c. Insert the screwdriver through the hole within the centerboard (and faceplate if optional
plug button is provided) and turn the damper's adjustment screw to provide the required
airflow.
d. If air volume for diffuser is specified on mechanical drawings, balance accordingly. If air
volume is not indicated and total system air volume is known, diffuser air volume must
be calculated. To determine individual diffuser volume, first determine the CFM per
square foot of active diffuser area by dividing the total CFM required in the room by the
total square foot of diffuser area, the multiply that value by the nominal sq. ft. of active
diffuser area (i.e. 8 sq. ft. for a 2’x4’ diffuser).
e. With a flow hood, balance for correct CFM per diffuser by first adjusting the highest volume
diffusers' metering dampers to specified airflow.
f. Continue adjusting individual diffusers to the specified airflow is obtained over the entire
system of diffusers.
g. Then, for each diffuser, attach the single stainless steel safety cable to the faceplate and
tuck the three safety cables up into the diffuser and reattach each faceplate by tightening
the quarter-turn fasteners clockwise. No further adjustments in balancing will be required.
STEP 6: GENERAL CLEANING
It is generally considered desirable for the hospital housekeeping staff not to require special cleaning
solutions for each manufacturer's product. We recommend any commonly used solution to clean
painted cabinet and ceiling finishes which are similar to the white baked enamel with which this system
is finished. Care should be taken to avoid spraying anything directly at the face of the Laminar Flow
Diffusers to prevent damage to the HEPA filter if the units have HEPA filters in them.
FOR ASSISTANCE, CALL 1-800-404-0931