Terra Universal Product Manual
WhisperFlow® Fan Filter Units
©
Copyright 2021 Terra Universal Inc. All rights reserved
•
Revised April 2021
Terra Universal, Inc. • TerraUniversal.com • 800 S. Raymond Ave. • Fullerton, CA 92831 • TEL: (714) 578-6000 • FAX: (714) 578-6020
7
3.2
WhisperFlow® Fan Filter Units
The WhisperFlow® fan filter unit has a 3-speed switch (low, medium, high) with a ¼ Hp permanent split capacitor motor.
The internal baffling plate and diffuser panel provide quiet uniform air flow across the filter face. FFU includes permanently-
lubricated bearings, factory balanced forward-curved blower wheel, ¼-20 thread holds on corners for guy-wire suspension,
and a filter membrane constructed from micro-glass. FFU uses FDA-approved silicon sealant and a 30% ASHRAE rated
MERV 7 pre-filter, 20” x 20” x 1”. The unit uses standard UL 900 filters and is tested to IEST recommended standards.
Room-side replaceable filter models feature fire retardant phosphorous free polyurethane gel-sealant to seat against a
knife-edge on the fan housing and easy-open clips for fast filter replacement from the room side without breaching the
cleanroom ceiling. The low profile design is ideal for cleanrooms with limited ceiling space.
There is challenge port fitting for a 3/8”-diameter challenge port, which can be used to take differential pressure
measurements to monitor filter performance or insert aerosols for leak-test certification. Port is capped when not in use.
PRODUCT DIMENSIONS
Nominal Unit
Size (ft.)
Active Filter
Area (sq. ft.)
W (in)
L (in)
H (in)
Weight
(lbs.)
2’ x 4’
7.2’
23.63”
47.56”
12.60”
71
2’ x 4’ (RSR)
5.2’
23.63”
47.63”
14.66”
71
2’ x 3’
5.3’
23.63”
35.56”
12.60”
53
2’ x 3’ (RSR)
3.7’
23.63”
35.63”
14.66”
53
2’ x 2’
3.4’
23.63”
23.56”
12.60”
44
2’ x 2’ (RSR)
2.2’
23.63”
23.63”
14.66”
44
