Allen, Very true. With our tarp setup it was completely open at the bottom=20 to insure that there was plenty of air for the heater and for us. Since=20 CO2 and CO are heavier than air they would fall out of the bottom of the=20 tarps and protect us from being poisoned by them. This is slightly=20 different from a closed building where these can build up to toxic=20 levels very quickly. Thanks, rich! On 11/28/2017 9:16 PM, Allen Mulvey wrote: > Much of the need for a "well ventilated area" is not so much > for fear of CO but rather a need for fuel. In a well sealed > environment you can burn off all your oxygen and asphyxiate > yourself. > > Allen > > -----Original Message----- > From: piclist-bounces@mit.edu > [mailto:piclist-bounces@mit.edu] On Behalf Of > mail@crcomp.net > Sent: Tuesday, November 28, 2017 9:33 PM > To: piclist@mit.edu > Subject: Re: [OT] Best garage heating option > > RussellMc wrote: >> On 28 November 2017 at 18:49, Gary Crowell > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .