As of August 2007 in Ontario, gas appliances which allow for plastic exhaust vents must use 636 certified venting. The Fuel safety Authority also known as TSSA (Technical Standards Safety Association) issued a directors order that ABS piping that was commonly used in the industry is no longer legal to use for venting gas appliances.
There [...]

Based on a couple of comments sent to the Backyardman surrounding the explanation of air retirements for gas appliances,  I have made an Excel spread sheet that can be downloaded and used for calculations and help remove some of the guess work. It will tell you if you have enough air or not for your [...]

All gas appliances need air including gas ranges. The most common problems come from the room in which the appliances are hooked up in and do not have enough air for usage except for what is in the room. General calculation is done by first calculating the volume of air in the room. Length x [...]