Specification Sheet

Air Handling Fan Direct Connect Installation
Page 5
Using a revolutionary new method of installation, the MA7, MA8 & MA10 have the ability to connect directly to
the HVAC air circulation fan motor. This provides cleaner and healthier air by utilizing the HVAC filtration
system during operation of our residential make-up air system.
During operation of the kitchen range hood, the Switch Assembly will activate the air circulation fan motor
independently of the heating and cooling system to open a motorized damper allowing fresh air to enter through
the return air duct. The outside air will then pass through the furnace filter prior to being distributed throughout
the air supply system. When air is no longer being exhausted by the kitchen range hood, the Switch Assembly
will return to the “off” position. The installation method will override or affect the normal function of the HVAC
thermostat or corresponding components. The HVAC system will heat and cool during operation of the make-up
air system as needed by measuring the internal air temperature of the home.
Recommended Fresh Air Intake Sizing
8” Motorized Damper—Up to a total of 1000 CFM total exhaust rating
10” Motorized Damper—Anything above a 1000 CFM total exhaust rating
Sizing the fresh air intake and duct symmetrically will help avoid air turbulence and drag while the
internal air supply is replenished during operation of the kitchen vent hood. The Switch Assembly is
powered solely by the HVAC control panel and is not connected through an external source or electrical
supply, making it safe for the use with the HVAC system.
During operation of a high CFM range
hood, unconditioned outside air is necessary
regardless of the method used to bring it
into the home due to mass balance
considerations. Furthermore, the
replenishment air will require heating or
cooling to the thermostatically programmed
internal temperature of the home whether
brought in by a make-up air system or
through natural air infiltration.
The size of the fresh air intake duct and motorized damper needs to be relative to the size of the kitchen exhaust ducting and air evacuation rate.
Switch
Assembly*