Topics:

• Install make-up air damper
• Instruction sheet part number 821152
• Installation instructions for part number 820071
• Accessory dampers part numbers 821147, 821148
• Using multiple dampers or fresh air vents
• Can the make-up air damper be used with an inline blower?
• Are replacement parts available?

Answer:

Benefits and Operation

The Wolf automatic make-up air damper provides a known, controlled pathway for fresh air to enter a home from outdoors when a compatible exhaust device is operating.

• The damper opens when a range hood is operating. 
• When in use, gravity and the exhausted air force the damper open and closed.

Dampers provide two key benefits for the home:

• Facilitates air exchange between indoors and outdoors, by drawing fresh air into the home to replace exhausted air.
• Helps avoid negative pressure conditions within the home, which may interfere with the proper operation of combustion equipment.

Installation

Make-Up Air Damper Installation Instructions detail the installation process.

• Damper kit components are listed on page 2 of the linked installation instructions.
  
• The damper is controlled by a pressure switch and independently powered. It is connected to a 120V supply, and the transformer installed reduces the power supplied to 24V.
• Consult with an HVAC professional for common make-up air return locations.

The factors that determine how much make-up air is needed for a certain blower and the measurements of air through ductwork will vary.

• Consult with an HVAC professional and local building codes to determine make-up air requirements or CFM factors.

Compatibility

The make-up air damper can be used with any Wolf Ventilation product.

• The damper is not required if using a recirculating kit.
• It can work with any blower or vent system, including in-line blowers.

A Wolf Ventilation system can be paired with another manufacturer's make-up air system as long as installation specifications are met.

• Consult with the manufacturer of the make-up air product for their specific ventilation recommendations.
• Make-up air systems are independently powered and are not connected to the hood.

Multiple Dampers

If more than one damper is required to balance a system, 8" or 10" accessory dampers may be purchased.

• 8" damper, part number 821147
• 10" damper, part number 821148. Note that the 10" damper is not motorized.

In a multiple damper application, use one pressure switch and transformer.

Wolf does not recommend any type of make-up air heater. The make-up air damper will not start the furnace or air conditioner unit when it opens. Consult an HVAC contractor for more information on this type of product.