Quality Chimney Service in Westland, MI
On the other hand, the sides of a chimney cap always allow air to flow. They do not save money by keeping house heat in. A cap’s functions are to keep rain, debris (twigs etc.) and “critters” out, including and especially birds. The screen also serves as a spark arrestor i.e. it will keep most “hot stuff” that comes up in the smoke from landing on the roof. They do a better job of keeping rain out as well because the lids are larger. These are important functions and no chimney should be uncovered. This option is usually the least costly.
There is the option to have both the damper and cover combined. For a couple reasons, too detailed to go into here, you can’t just put a chimney cover over a top-sealing damper. The biggest reason for this is because a damper lid won’t fit inside a standard cover. With that said, some manufacturers make a combination unit which gives you both the extra animal and weather protection. This combo also allow you to benefit from the heat savings of a chimney cap and damper all in one unit. This is usually the most costly option, but certainly the nicest.
For safety sake, you need a damper. For economics sake, you should invest in a top sealing damper. For the best of both worlds, spring for the damper-cap that provides a little bit of everything and avoid chimney problems.