Stop Chimney Downdraft

It all depends on hot air rising the hotter the fire the faster the air rises.

Stop chimney downdraft.

Draft is the force behind flow while capacity is the capability to handle flow. The air pressure in the lower zones can be lower than atmospheric pressure and if the fireplace is located in one of these zones the chimney may have a permanent downdraft. From the first stone rings stacked around the campfire to the modern factory built fireplaces with carefully engineered dimensions there has been a steady evolution of design parameters to. The current created draws air from the fireplace surround feeding the flames as it passes the fire.

The h top is the only cowl which may reduce the effects of true downdraft. When a downdraft occurs exhaust from the fireplace that should be vented outside the home backs up into the living space making your indoor environment not only uncomfortable but dangerous. Check these possibilities before going to the extent of making an h top. Make sure there is sufficient air supply to your furnace and water heater.

But remember that true downdraft is rare and providing that the manufacturers chimney specifications are followed in most cases negative pressure is caused by other factors. I fitted a stove with a new chimney last year but it had a dreadful down draught problem on certain nights the smoke would come down the chimney and fill th. To understand why a downdraft happens you need to know a little about the operation of the chimney. There are actually two distinct though related factors affecting chimney performance.

By peter hotton globe correspondent january 19 2014 12 00 a m. We have installed a wood burning stove which is tightly sealed to the clay tile. If your appliances are not vented to the outside you may be reducing the air pressure making the problem worse. Five ways to stop a cold downdraft in your fireplace.

5 solutions for chimney air leaks. Chimney downdrafts occur when something disrupts the natural air flow of a chimney. See how to stop downdraft in chimneys here chimney workings.