I recently had my older 80% efficient gas furnace replaced with a new 98% efficient furnace. The furnace is located in an unheated 18' x 30' crawl space. The crawl space is vented to the outside with two 6 x 14 vents at opposite corners of the crawl space. The old furnace used combustion air from the crawl space and exhausted through a type B vent routed up through a chase, thru the attic and out of the roof. The new furnace was installed and, I think, unfortunately was set up to continue to draw it's combustion air from the crawl space. It seems to me that drawing cold air from the outside, into the crawl space, is not as good as drawing only the cold air needed, thru a pvc pipe connected directly to the furnace. IOW for overall home energy efficiency and heat conservation I think drawing cold air into the entire crawl space to supply the furnace is not as desirable as having the furnace intake air piped directly to the outside. I have included some photos of the furnace and piping. The HAVC contractor ran the new pvc exhaust thru the existing type B vent. There is plenty of room inside the type B vent for another equal size pvc pipe. The photos show that, due to how the exhaust pvc was attached to the furnace, there is not enough room for an intake pvc 90 degree elbow to attach. My questions are: 1) Am I correct that piping the intake to the outside will help enough with overall energy efficiency to make it worthwhile to do? 2) If I add the fittings needed to make room for a 90 elbow to attach to the furnace for intake, would those additional fittings unduly compromise the exhaust flow? I have a lot of home building and repair experience. Expertise as carpenter and ok with simple plumbing, electrician, tile setting, drywall etc work. Thanks in advance for any advice or comments. [attach]107258[/attach] [attach]107259[/attach] [attach]107260[/attach]

Hello, Model: 58mta060-f-12112 Inducer model - direct replacement recommended: 326058-755 Motor itself has same number on old one: HC27CB121 Problem 1: When it appears to be in place - standoffs on screw holes, there's a gap between collector box groove and the back of the inducer, I can't push it in any more. Is there something carrier isn't telling us about -> ie standoffs too long, housing design slightly changed. Or am I just missing something and mis-aligning it? Reviewing manual just now, it says "Install new inducer housing assembly to heat exchanger cell panel by aligning guide pins in collector box." No illustration of guide pins. Where are the guide pins? It's very hard to align because the inducer doesn't fit in position without the exhaust pipe connected - the pipe can't be completely pushed out of cabinet, return drop is in the way. Problem 2: One standoff was lost while trying to remove and re-align. It's not anywhere to be seen, even checked collector box. Is there a generic replacement for this? This seems to be the part: [url]https://www.repairclinic.com/PartDet...92-201/2356361[/url] [url]https://www.carrierenterprise.com/standoff-319892-201[/url] If not, is it harmful to not use the standoff and just have the bolt? Last resort.