AAF International PRU - Manual (Page 9)

9
3.5 Preparation for Filter Installation: In order to maximize the life
of the gas-phase chemical filters and the particulate filters, it is
recommended that filter installation be the final installation task before
start-up and commissioning of the system. In preparation for filter
installation, it is recommended that the following be completed:
– Completely clean the system to remove all construction debris
and dirt, sweep and vacuum to remove visible dirt.
– Damp wipe all surfaces to remove dust.
– Finalize and complete all caulking in the system.
– Finalize and complete all painting in the system.
It is recommended that all cleaning materials and paints used in the
system be free of solvents. If this is unavoidable, it is recommended
that sufficient time be allowed for complete drying to occur and for the
VOCs to disperse before installing the filters. This process can be
accelerated by “blowing down” the system; i.e., operating the fan
without the filters to ventilate the system. It is recommended that a
Place the prefilter into the prefilter track.
Step 1: Insert the prefilter into the track
Step 2: Slide the prefilter in as far as it will go
Step 3: The installed prefilter
Repeat the process of prefilter installation until all prefilters have been
installed.
blanket-style construction filter be installed at the inlet to the system to
prevent construction dust from being drawn into the system. Consult
with your AAF representative to obtain an appropriate product. Also,
before “blowing down” the system, check that it is safe to operate the
fan without the pressure load of the gas-phase chemical filters.
Consult the AAF submittal drawing for pressure information.
3.6 Prefilter Installation: Prefilters are used to prevent the build up of
lint and dust on the face of the gas-phase chemical filters. If prefilters are
not installed, the effective operating life of the gas-phase and high-
efficiency final filters may be reduced.
Install the prefilters as shown in the sequence shown below. The
standard RU is designed to accept 2" deep prefilters only. For best
results, AAF recommends the use of the MERV 7 rated PerfectPleat.
The tracks are spaced and sized to accept 24" x 24" x 2" and/or 24" x
12" x 2" nominal ASHRAE style filters.