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Found 9 results for the keyword(s) ‘Combustion Air’

  • Article

    Stopping cold air drafts from ducts to the outdoors.

    I get a lot of complaints about cold air drafts coming in through ducts connected to the outdoors. Here are some solutions.  Butterfly dampers Any exhaust vent that rises up and out will have a tendency to let cold air fall back down that duct. Quality butterfly dampers are available that have ...
  • Article


    Traditional furnace rooms are nothing more than a partition designed to hide an ugly furnace. They are neither sealed nor insulated, and they obtain combustion air from the house through door or wall grills of the open floor joist area. Sealing off the drafty leaks in a house and introducing a sy...
  • Article

    OVERVIEW:Improper exhaust fans can pollute your home -- could even kill you

    More and more people are asking for powerful kitchen range hoods or bathroom exhaust fans. The logic appears simple, increase the power of the exhaust fan and get rid of pollutants quicker. In more and more modern homes which have been weather-stripped and sealed against cold air leaks and heat l...
  • Article

    Improving a wood chimney to stop backdrafting

      Rick from New Brunswick is having problems with his wood stove backdrafting and he wants to know if it will help to box in the chimney on the outside of the house. Backdrafting or difficult starting with wood burning appliances is often a problem and there are several entries in this database ...
  • Article


    FURNACES & BOILERS Well-sealed houses need a fresh air supply for combustion. (search keyword "Combustion Air" for the title "DOES MY FURNACE GET ENOUGH AIR?") The most common technique in basement installations, is to use an insulated duct to dump air next to the combustion intake.  The gas...
  • Article

    Does your contractor know about the furnace room combustion air damper?

    Many years ago, because of the prairie enforcement of the gas code provision that you had to supply fresh air to a furnace, an inventor in Alberta began marketing the Hoyme damper. This is a motorized damper that closes off that combustion air duct from the outdoors that dumps cold air into ...
  • Article

    The fireplace stinks a sooty smell.

    Brenda from Port Hardy, B.C. says that her wood burning insert smells of soot when it is not in use.The problem is obviously one of air coming down the chimney. Either the exhaust fans in the house are drawing air when there is no fire to maintain an upward draft, or the wind is twisted around on...
  • Article


    A combustion furnace or boiler (gas, oil, coal or wood) requires air to burn and air to maintain a proper draft in the chimney. In a leaky old house with the furnace in an open basement this is never al problem. As the house becomes better sealed, several problems can arise:-- An automatic v...
  • Article

    The combustion air duct for my furnace freezes the basement. What to do?

    When the contractor installed a new furnace, he put in a great big air duct from outdoors right into the furnace room. This tends to freeze the basement floor. Can I close it off?Response:This duct is necessary in most modern homes and even in well sealed renovations to assure adequate air f...