Heat and Air Tips

Chimneys

As an important part of your heating and ventilation system, it is important to have your chimney cleaned and inspected at least once a year if it is used regularly.

Inspecting the Chimney
In the fall, watch for a weak chimney draft. Since the temperature difference between chimney smoke and outdoor air is not so great during the fall season, smoke won't rise as quickly as it should. This may cause too much smoke to be in the room.

Back-puffing can also be a danger. An obstructed chimney or flue causes smoke to build up in the house. Blockage can be caused by soot and creosote buildup or by bird's nests. Most chimneys are built of brick and lined with fireproof flue tiles. A cap of mortar seals the top against the weather. To inspect a chimney, follow this procedure:
  1. Using a strong flashlight, check inside the chimney for soot buildup and any obstructions, such as birds' nests or leaves.
  2. Check the flue tiles for cracks or missing mortar.
  3. On the chimney's exterior, look for crumbling mortar between bricks and at the cap, loose or missing bricks, or flashing that has corroded or pulled away from the chimney. These can cause chimney leaks.
Cleaning the Chimney
Your chimney should be cleaned regularly, since built-up soot and creosote restricts the draft, making your fireplace or wood stove inefficient. A dirty chimney may even cause fires. Since this is an incredibly messy job, you may want to hire a professional chimney sweep to do it. But if you do it yourself, follow these steps:
  1. Cover the fireplace opening with newspaper and protect nearby furniture, carpets, and draperies.
  2. Wear a dust mask and goggles.
  3. Use a good steel chimney-sweeping brush to clean the chimney from up on the roof. Attach the brush to a rope at least the length of the flue and chimney, and attach weights to the end of the brush.
  4. Pass the brush repeatedly down to the flue bottom and up again until the brush no longer brings up large amounts of soot and creosote.
  5. Use a heavy-duty vacuum – not a household model – to vacuum the fireplace.
Brushes and weights are available from home improvement centers and wood stove dealers. You also can buy fiberglass rods that attach to the brush. These may be useful for cleaning long horizontal runs of stovepipe or for cleaning a chimney from below.

If your chimney is leaning, has several bricks missing, or if the flue needs repair, consult a professional.



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