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The Skuttle Make-up and Combustion Air Diffuser (Model D-28-6) is designed to supply combustion air to fuel-burning appliances that have inadequate combustible air sources.

How the Diffuser Works

Generally installed 12 inches (30.48 centimeters) from the appliance’s combustion air intake, the Diffuser connects to a 6-in. (15.24 cm) insulated duct which, in turn, connects to a screened, fresh air inlet mounted on the home’s exterior. As the colder, heavier outside air enters the Diffuser, the unit acts as a check valve or cold air trap, automatically diffusing auxiliary combustion air into the area around the appliance.

Features and Benefits
  • Works in any home as a fresh air supply.
  • Provides combustion air when other methods do not supply sufficient air.
  • Reduces drafts caused by negative pressure.
  • Aids in reducing indoor air pollution by replacing exhausted air.
  • Traps cold air entering the home.
  • Made in the USA.
Proper ventilation, in combination with humidification, filtration and air purifications systems can create a healthier, more comfortable environment in your home.
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Manuals (1)
Product Type:
Air Control
Duct Size:
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