8
TFP Connected to Heat Recovery Ventilator
Location
The TFP should be located in the main trunk of the fresh air to
house line, after the Heat Recovery Ventilator (HRV) and before
any branch lines. (Fig. 3)
Mounting
1. Locate mounting bolts (4) on side of TFP cabinet for vertical
hanging (Fig. 3) and remove.
2. Measure distance between the bolts and mark it on the
floor/header joist where the TFP is to be hung.
3. Fasten hanging straps to floor joists using wide head nails or
screws with washers.
4. Insert hanging bolts through prepunched holes in straps and lift
TFP into position. Tighten and secure bolts.
Ducting
1. Install (2) 7” collars (provided) on TFP cabinet with (8)
8/32” X 3/8” sheet metal screws provided.
2. The ducting between the TFP and the HRV, and between the
TFP and the main supply trunk line to the house, should be
kept as straight as possible.
3. A relief opening or breathing T is required to prevent pressure
differences.
4. A short piece (1-2 foot) of flexible ducting should be used on
both sides of the TFP (Fig. 3). This will reduce vibration and
noise transfer if present.
NOTE: Please refer to the HRV installation manual for proper
ducting of that appliance.
Breathing T
The “Breathing T” is designed to assist in neutralizing pressure
differences which can occur between the HRV and the TFP when
joined together. The “Breathing T” should be situated in an area
with suitable indoor air quality (IAQ). Avoid mechanical rooms
and workshops. If required, an external connection should be made
from the “Breathing T” to an area with suitable IAQ (the air
should be free of fumes, vapors, odors, or large airborne particles
etc.).
The room in which the “breathing T” is open
should be free of combustion equipment such as
gas hot water tanks and furnaces. If the “T”
must be exposed in these areas, a pressure test
(spillage or backdraft test) should be conducted
on the combustion equipment after everything is
installed.
CAUTION
TYPE 2 INSTALLATION
To a Fully Dedicated HRV System
Breather Tube
(Standard
Galvanized
"Tee" Fitting)
Fresh Air
to House
Fresh Air
to House
Stale Air
from house
Air
Cleaner
HRV/ERV
Breather
Tee
Outdoors
Figure 3
