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A ventilation controller with a manual override is located on a central air handler fan that is located in an accessible location
Air flow is produced when central HVAC fan is energized (set thermostat to “fan”)
Air seal and insulate around the exhaust fan with a rigid foam box
Air seal around kitchen and bathroom exhaust fans to keep conditioned air from leaking into unconditioned space.
Air seal whole-house fans to minimize air leakage.
Allow two to three feet of straight duct run from the fan exhaust port to the first elbow
Bathroom exhaust fan can vent out through the wall or up through the roof
Build an air-tight rigid box to cover the exhaust fan
Caulk or foam seal between the exhaust fan housing and the ceiling gypsum; install a gasket or caulk around the exterior exhaust duct vent
Continuous supply and exhaust fans rated ≤ 1 sone by manufacturer
Continuously-operating ventilation & exhaust fans include readily accessible override controls
Cover the box with insulation
Cut a neat hole in the ceiling with smooth edges in which the exhaust fan housing will fit snugly
ENERGY STAR requires exhaust fans set for intermittent operation to have a sound rating of ≤ 3 sones and exhaust fans set for continual operation to have a sound rating of ≤ 1 sone.
ENERGY STAR-rated ceiling fans save energy when operating and provide cooling movement to reduce the need for coolant-based air conditioning.
Exhaust fan installed but in wrong direction causing excessive bend and duct is uninsulated
Exhaust pipe should be made of smooth, rigid duct and any bends should be gradual, not sharp
Fan exhaust ducts vent out through the soffit vent.
In line exhaust ventilation installed
Install the fan either in the range hood, the cabinet above the stove, or on the wall above the stove
Install the whole house fan in the ceiling in a central location in the house
Insulated whole-house fan cover
Intermittent supply and exhaust fans rated at ≤ 3 sones by manufacturer, unless rated flow ≥ 400 CFM
Manufacturer’s label found on this exhaust fan housing shows a sone rating of 2.5
Override control switches centrally located near thermostat for ease of access
Proper sizing for kitchen exhaust fan
Properly installed ERV/HRV
Properly installed ERV/HRV
Rater-measured ventilation rate is within 100-120% of HVAC contractor design value (2.11)
Right – Cleanly cut and properly sized hole
Right – Fan with a cleanly cut and properly sized hole has been air sealed to drywall
Right – Kitchen exhaust penetration has been sealed with caulk
Sone rating is 3.0 for this intermittent exhaust fan
Sone rating is greater than 1 on a continuous exhaust fan
Sone rating is greater than 3.0
Sone rating is less than or equal to 1 on a continuous exhaust fan
Test the thermostat fan, cool, and heat settings
The ENERGY STAR logo on the manufacturer’s label indicates this is an ENERGY STAR qualifying exhaust fan
The exhaust fan housing may have holes that allow conditioned air to leak into the attic
The fan does have an ENERGY STAR label
The fan does not have an ENERGY STAR label
The gap around this kitchen exhaust duct represents a significant source of air leakage to the unconditioned attic
The manufacturer’s label found on this exhaust fan housing shows a sone rating of 1.0
The ventilation controller is next to the thermostat and has a manual override button
This bath exhaust fan ventilation control can be set by the HVAC technician for continuous operation, delayed shut off, or a set amount of minutes each hour
Vent the kitchen fan exhaust directly to the outside, not into an attic, crawlspace, or space between floors
Ventilation tied into the return with a mechanical damper
Ventilation tied into the return without a mechanical damper
Whole house fan cover details
Whole house fan with a built-in insulated cover
Whole house fans draw cool night-time air in through open windows and expel hot house air into the vented attic
Wrong – Kitchen exhaust has not been air sealed
Wrong – Overly powerful kitchen exhaust fans can backdraft other combustion appliances in the home
Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal
Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal
Wrong – Whole house fan installed with holes in surrounding platform that need to be air sealed
Wrong – Whole house fan installed without an insulated cover