Terra Universal Product Manual
WhisperFlow® Fan Filter Units
©
Copyright 2021 Terra Universal Inc. All rights reserved.
Terra Universal, Inc. • TerraUniversal.com • 800 S. Raymond Ave. • Fullerton, CA 92831 • TEL: (714) 578-6000 • FAX: (714) 578-6020
9
3.3
Reverse Air-Flow Room-Side WhisperFlow® Fan Filter Units
The exhaust flow fan filter unit converts any room into a negative pressure isolation/containment room with a HEPA filter
that is 99.99% efficient at 0.3µm particle diameter. The unit mounts into the ceiling bay with ¼-20 UNC threaded inserts
available on the corners for guy-wire suspension. The MERV 7 filter is 30% ASHRAE rated with an FDA-approved acrylic
urethane sealant that prevents air leakage from the inside housing. There is a removable yellow power cord with a 4-pin
connector that provides easy installation to Terra cleanrooms. This connector may be used with an optional wall plug
adapter or may be removed entirely to hard-wire the FFU. The optional duct collar attachment allows connection to
ducting system for safe exhaust outside of room.
The unit consists of a ¼ HP, thermally protected, variable speed motor that provides precise, fully adjustable airflow and
drives a backward-curved centrifugal blower. The dust collection pan collects particles that fall off the outside of the filter to
prevent them from being reintroduced into the surrounding environment. Air is drawn into the unit through the dust
collection pan and exhausted out through the blue MERV 7 filter. The MERV 7 filter protects against dust and debris from
falling into the impellor. The motor is controlled by an electrical speed dial control and this dial can function as ON/OFF for
the blower starting from high to low flow rates. The dust collector pan can integrate with bag-in/bag-out (BIBO) systems
and is easily removed for cleaning or maintenance.
Figure 3: WhisperFlow® Reverse-Flow FFU
