Lifebreath 95MAX User Manual download pdf (Page 20)

Supply Air Ducting

In homes without a forced air furnace, fresh air should be

supplied to all bedrooms and living areas, excluding

bathrooms, kitchen and utility areas. It should be supplied

from high wall or ceiling locations. Grilles that diffuse the air

comfortably such as the Techgrille™ are recommended.

If the floor is the only option available, then special care

should be taken in locating grilles. Areas such as under

baseboard heaters will help to temper the air. Also optional

inline duct heaters are available for mounting in the supply

duct work to add heat if required.

In homes with a forced air furnace, you may want to connect

the HRV/ERV to the furnace ductwork (see information

below).

Direct Connection to Furnace Ductwork

Should you wish to hard duct the supply air directly into the

cold air return of the furnace, remember to check the air

flow balance of the HRV/ERV with the furnace fan both

"ON" and "OFF" to determine that it does not imbalance the

unit more than 10%. Also, it is advisable to include a short

length of fabric flex duct or other non-metallic connector in

this hard ducted line in order to keep the HRV/ERV

separately grounded (electrically) from the furnace. This will

avoid a possible shock hazard to service people if a short to

ground develops in one of the devices.

Indirect Connection to Ductwork

If permitted by local codes, an indirect connection may be

made between the HRV/ERV supply duct and the furnace

return plenum. The fresh air from the unit may be directed at

a grille installed in the cold air return duct of the furnace.

The fresh air supply outlet from the unit should be no closer

than 4 inches (100 mm) and no more than 12 inches (300

mm) from the grille.

Stale Air Exhaust System

The stale air exhaust system is used to draw air from the

points in the house where the worst air quality problems

occur. It is recommended that return air ducts are installed

in the bathroom, kitchen, and laundry room. Additional

return air ducts from strategic locations (i.e. greenhouse,

atrium, swimming pool, sauna, etc.) may be installed. Also,

the furnace return duct may be used to exhaust from. In this

method, the exhaust air is not ducted back to the HRV/ERV

with "dedicated lines" from bathrooms, kitchens, etc.

Instead, the exhaust air is drawn out of the cold air return of

the forced air furnace. This method has become popular

and provides good ventilation when installed in accordance

with the instructions. The furnace blower must be running

when the unit is operating for this system to be effec-

tive.

Dampers and Grilles

The use of balancing dampers and/or adjustable grilles to

balance the flow rates into various rooms is recommended.

We suggest TECHGRILLE™ air diffusers.

• The TECHGRILLE™ is available in 4", 5", 6" and 8" (100,

125, 150 and 200 mm) sizes.

• The TECHGRILLE™ is a round, fully adjustable grille,

which provides superior, quiet air distribution.

We recommend the use of high mounted wall returns with

grilles. The exhaust air duct from the kitchen should never

be connected to a range hood. Instead, the exhaust grille

should be mounted high on the wall at least 4 feet (1.2 m)

horizontally away from the stove. A "flip-up", 6" X 10" (150 X

250 mm) rectangular kitchen grille with removable grease

filter is available (Part No. 10-002).

Dampers should be located just prior to the HRV/ERV to

balance the stale air exhausted out of the house with a fresh

air supply entering the house.

AIR FLOW

SUPPLY

AIR FLOW

EXHAUST

Techgrille Air Diffusers

Kitchen Grille

Removable

filter

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Lifebreath 95MAX User Manual Page 20

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