Re: [CAD_CAM_EDM_DRO] OT: Intro + Q:Selecting workshop heater

Hi Tim,

I vented my unit horizontally through the side wall of my shop with a piece
of bvent through a wall thimble, (OUTSIDE PART:)through one straight piece,
to a 90 el, up vertically 2 straight pieces and capped it with a tee.
Through the wall thimble to the capping tee I used bvent, a dual walled
galvanized system. I did not use their special fittings. Note that
different manufacturer's bvent fittings and pipe are not interchangeable due
to the differing locking joint designs.

For the inside venting from the unit heater to the thimble I used single
wall gal pipe; half of one 3" diameter piece to a 3" to 5" expander. The 5"
end I crimped to fit inside of the inner tube of the bvent thimble. Note
that there are (at least)two gauges of single wall, get the heavier. I
think it is 22 where the other is 26. I sealed that 3" to bvent with a 350
deg f rtv that I picked up at the plumbing/hvac shop. I used this same
sealant to seal the annulus of the bvent right where the single wall pipe
connects. All of the other inside seams I sealed with aluminum tape. I did
not bother with a drip tee in the venting, but I did drill a drain hole in
the 90 el outside. I yet need to put birdscreen in the tee that ends the
venting.

To stabilize the outside venting, I used 3 pieces of galv angle screwed to
the top of the tee. Two are horizontal, each making a 45 to the outside
wall of the bldg and a vertically sloping piecemaking a 45 to the bldg in
the vertical plane. I have already used my head as a battering ram on the
90, accidentally, and I lost. I have since planted a shrub under it so I
will not be tempted to cut the corner short.

As far as the high altitude, I think that you just need a smaller orifice,
not sure of the size, to account for the decreased density of the air. You
will also get less heat out of the unit. But the cost difference between
the units being so small, I just got the big one.

I am very happy with the unit.

Joe Fahy
In still Snowy Central PA

----- Original Message -----
From: "Tim Goldstein" <timg@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Wednesday, December 20, 2000 1:15 AM
Subject: RE: [CAD_CAM_EDM_DRO] OT: Intro + Q:Selecting workshop heater


>
> John,
>
> Thanks for the tip on the Modine Hot Dawg. It is exactly what I am looking
> for. I was looking at the unit heater offerings from Grainger, but the Hot
> Dawg give more features for less money than the Grainger units and the
form
> factor is much nicer. I called the Green House catalog company your post
> referred to and asked about what I need to order for high altitude use and
> the cost. They said they would call back with the details, but they had to
> call the manufacturer to get the scoop. Did you buy the "special" vent cap
> that they offer or did you get one locally?
>