Air extraction pipes are located within your attic space and are designed to transport air from inside your home to the outdoors as quickly and efficiently as possible. There are three generic types of air extraction pipes commonly used within the Calgary construction market. There’s one for your bathroom, another for your stove hood vent and one for your dryer.
An improperly functioning pipe will allow this moist air to become trapped in your home or your attic which can cause severe issues, such as mold. It’s not hard to ensure these are functioning properly, we recommend having your roofing contractor or a qualified inspector have a look at them periodically.
A typical material type for your bathroom and stove hood fan, if your home was built before 1990, is of a rigid metal pipe style. The metal pipe will be cylindrical in shape and connect from the top of your fan up through your attic onto the roof deck where specialized roof vents are installed to let air out while keeping snow and water from coming in. Nowadays though, it is more common to see a flexible style pipe instead of a rigid metal one. One end of the pipe is connected to your fan with a metal clamp and the other end is connected to a roof deck and adaptor to help minimize the amount of air backflow into your attic space.
Dryer vents are a little bit different. Dryer vents requiring an HVAC specialist to complete the installation from start to finish. This is an Alberta Building Code requirement. Dryer vents are special because lint from your clothes needs to flow freely through the pipe. If the lint begins to clog and get stuck then a blockage can build up, and a big blockage can cause your dryer to overwork, overheat and potentially even catch fire.
Whatever the type of air extraction installed, it’s important to ensure that it is properly insulated with an insulation sleeve. Insulating your air extraction pipe helps to ensure air moving through the pipe remains the same temperature until it is exhausted from the roof vent. If it is particularly cold outside and the air from your pipes is allowed to cool down sufficiently it will begin to freeze and form ice through the process of condensation, which will eventually drip back down into your house causing a leak and staining your drywall, ceiling, and beautiful floors.