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Path: utzoo!linus!philabs!micomvax!othervax!ray
From: ray@othervax.UUCP (Raymond D. Dunn)
Newsgroups: net.consumers
Subject: Re: Help with poorly drawing chimney
Message-ID: <734@othervax.UUCP>
Date: Thu, 5-Dec-85 11:26:35 EST
Article-I.D.: othervax.734
Posted: Thu Dec  5 11:26:35 1985
Date-Received: Sat, 7-Dec-85 16:15:50 EST
References: <301@ihu1n.UUCP>
Reply-To: ray@othervax.UUCP (Raymond D. Dunn)
Distribution: net
Organization: Philips Information Systems - St. Laurent  P.Q., Canada
Lines: 28
Summary: 

In article <301@ihu1n.UUCP> johnnyr@ihu1n.UUCP (John R. Rosenberg) writes:
>........
>Anyone out in net.land know how to improve the draw in a chimney, or
>possible causes of poor draw in general. Any advice or suggestions
>would be appreciated.

Several devices can be bought which work equally well.  All operate on the
principle of using the wind to reduce the pressure in the chimney.  The two
main styles are:

a) An "inverted L" shaped extension to the chimney which has a vane on it
   and can rotate, so that the open end is always kept pointing down-wind.

b) A spinner type device on top of the chimney (known as a "granny" in my
   native Scotland), which rotates in the wind, and sucks air up the chimney.
   This device can sometimes become annoyingly noisy.  These are often also
   seen as attic forced ventilators.


Before installing such a device you should consider other factors.  Is your
chimney too wide?  This can also affect its draft.  Perhaps the installation
of a chimney "damper" would do the trick.  Test this by partially blocking
the chimney (something non-combustible of course!)

If your chimney is in the wind shadow of an adjacent taller building, even
adding a straight extension pipe to the top could be effective.

Ray Dunn.  ..philabs!micomvax!othervax!ray