doug houseman wrote in message ...
I do not know what your rafter spacing is,
Rafters are 2X6 20" OC

Fan Tunnels without the holes in them for greenhouses - they come in 12, 16 and 24 inch diameters. I use the 12 inch between rafters that are 16 inches on center.
16 or 18" would probably fit between the rafters. Are they
transparent enough to transmit lite through them. The description on
line was minimal, but they looked opaque.

I use 12
inch greenhouse poly patch to seal one end and most of the other and
then lay them between the rafters and take IR treated poly and staple it
to the bottom of the rafters to hold the tunnels in place. (this gives
me a 6 inch in the middle and 2 inch on the edges oval if I staple it in
tight.)

I use a greenhouse inflation fan and a set of dryer hoses to
keep air in the tunnels and keep them full. I draw the air I use in thru
a sidewall with a dryer vent...To make multiple runs to the tunnels I
use PVC T sections and pipe clamps to T the hose - I reduce each tunnel
run to 1-1/2 inch (apartment dryer hose). In the summer I toss the IR
sheet I stapled up and the rest folds into a single storage bin. I use a
commercial dryer vent cap to close off the dryer vent and keep the bugs
out of the greenhouse.

Can the tubes be sealed at both ends, remain inflated, and left in
place?

Hope this helps.

Farmtek stock numbers (I have the catalog at hand - this is not a
recommendation - though I have had good luck).

This was great. I've done some research and had not really checked
them out yet. They are book marked now.

Tape - 6inch - 102376 - 60 feet on a roll - 16.95
6 mil film - ask for the IR version - 10 foot width - $0.65 per square
foot - 103023
12 inch convention tube (fan tunnel) - xr6948 - $0.53 per foot - do not
have them "punch it"

PVC T's and Dryer hose - see home depot or the like
Same for staples and hose clamps

Inflator fan - about $30 - it is not in the fall catalog -sorry

Doug

Thanx so much for your help. I admit being a novice. Was excited
about building the room, but started late in the season. Framing the
walls started in September. Building on a budget, what an adventure.
The orientation maximizes the southern exposure. The end that shows
in the picture faces southwest. The long row of windows faces south
east. Northwest is protected by the house. It has been a real hoot.

Thanks again,

Nancy