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with low energy cost. These efficient units usually
have motorized and insulated doors and can be used
to meet cooling loads and the requirements of many
energy-efficiency programs.
A whole-house comfort ventilator can reduce airconditioning
operating costs and help prolong compressor
life by ridding a house of hot air before the
air conditioner is turned on.
Mounting configurations
Whole-house comfort ventilators are mounted in
one of three ways:
• Horizontally – Suspended on joists over a ceiling
opening in a central location and concealed by a
ceiling grille or a shutter with automatically opening
louvers.
• Vertically – Usually installed in a gable end with
a motor-operated ceiling grille in a central location.
You can install smaller fans in a wall of the living
space.
• Through the wall or roof in houses that have no
attic.
Note: For these systems to work properly, there
must be adequate openings from the attic to the outside.
Openings should be provided equal in “clear”
area to the airflow in CFM of the fan divided by 750.
For example, a whole-house comfort ventilator with
a 3,000 CFM capacity should have openings from the
attic to the outside equal to a clear four square feet.
Whole-house comfort ventilators are modular, requiring
only minimal on-site assembly; manufacturers
usually provide templates for cutting ceiling,
gable or wall openings.
Control options
Timers and thermostats are available for starting
and shutting off fans automatically. Two-speed and
infinite-speed controls are available on some models,
and other models include remote or “smart
house” controls.
Note: To prevent negative pressure and back
drafting of combustion appliances, automatic controls
must not be used when windows are closed. ■
circle 68 on reader service card
circle 69 on reader service card
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