I think T-Bones is over reading the info. NO, I am not wrong, and you are only 1/2 wrong. So I am still ahead. LOL I got my information off the website: http://www.blueflame.org/datasheets/combustair.html If you will goto that site and scroll down toward the bottom and look under the heading, " Air Supply to a Furnace Installed in a Small Utility Room or Confined Area you can read exactly what I posted. It came from the blueflame people themselves. It tells you how to do it and figures your hole for you and everything. T-Bones is only half right in his post above, where he states, Provide additional ventilation of at least 2 sq/in per 1000btu/hr of input for any additional fuel burning appliances used at the same time. If you read the statement, you clearly see that the 2 inch hole is there because you are operating 2 appliances. If you had 3 heaters running, you would use a 3 inch hole per 2000Btu's and so on. I stated the rule of Thumb and I will state it again. For reference: The rule of thumb is 1 sq. inch per 2000btu's of heat for an air intake in a tight greenhouse. Most greenhouses are only going to have 1 heater running inside them. The hobby houses on this forum will use small heaters at best. Once again more references for those that need proof. Websites: http://www.greenhouses-etc.net/heating/nv_gas_heaters.htm They show a 20,000 btu heater, and recommend a 3inch pipe. We can work out the math, 3 in x 3 in is 9 square inches. 9 x 2000= 18,000 btu. Their btu rating is on the higher side. They are saying about 1 sq inch for every 2222 btu. And no this is not why people get killed. People get killed because they dont read directions. They dont follow rules and they dont do their own research first, and another thing, you can have all the rules and rule books in the world, but if you don't apply a little COMMON SENSE every now and then, your going to get hurt anyway. Please, lets not shoot each other down. If you have a problem with someones information, just ask them about it. I been running my greenhouse on facts for 15 years now, why on earth would I want to tell you something wrong or incorrect. I dont just pull this s__t out of the air and type it on the screen.

Boxerpups: First, where are your pictures? If on your computer only, you'll need to upload them somewhere on the web for the rest of us to see them. I upload pictures to PhotoBucket. Open an account w/PhotoBucket or other photo hosting site. Take a picture using a digital camera (or film camera but get them on disk when they're developed) Resize your pics so they're approx 400x300 (resize keeping the same proportions so they don't get distorted...i.e., don't specify a specific size, use %-ages or similar) Upload your pictures to your photo account Find the label that contains the link to the picture (In PhotoBucket, it's the box labeled "HTML Code") Copy that link and paste it into the "Message" box of a post. When you "Preview" your message, you'll see the picture. Posting a picture from somewhere other than your Photo hosting account Copy the following into the "Message" box where you want the picture to be: Next, replace the http://www.XXX/image.jpg with the address of the image. When you "preview" the message, you should see the picture

Buehl, please do! I was just trying to save something of use. I'd been checking the GW all night, turned my back for 15 minutes to watch the Health Care vote, and whammo! all the posts were gone. I kept refreshing, thinking, "This can't be!"

board is moving fast today!