furnace designs

jaybee

Hello everyone I would like to know what the difference between upflow,horizontal,and down flow furnaces?

Pat_11

furnaces

Describes the air flow pattern thru the furnace and its orientation. Most residential furnaces are configured
Return Air in - FAN - HEAT Xchanger - supply air out
An upflow furnace air is brought in the bottom or sides of the blower cabinet and pass across the heat xchanger and out the top.
A down flow furnace is just turned upside down.
A horizontal furnace is just laid on its side and air pass left to right or right to left depending upon model.
Most furnace mfg sites should show so pictures.

John@Reliable_9

Here you go jaybee in simple terms

upflow = hot air blows out top
horizontal = blows out the end
downflow = blows out the bottom(slab & mobilehomes)
Hope this helps John@Reliable

jaybee

furnace desings

Thanks once again! You guys will be hearing a lot from me,im hingry for knowledge about this buisness.I was always told a close mouth is never fed!!!!

Matt Undy

The reasons for these different orientations is to accomodate different duct arrangements. Upflows usually are used when there are few constraints on where the ducts may be run or where those cosntraints result in an upflow duct arrangement, downflows are frequently used on basementless homes where the furnace is on the main floor, and the supply ducts are in a slab or crawlspace underneath. Horizontal furnaces are used where a furnace must fit in an atic, kneee wall or crawl space. These are jsut examples, use your creativity as to which furnce fits your application. There is also a style called a lowboy which was much more common in the past. It has supply and return in the top, is a little shorter, and has the blower mounted to the side bevor the HX instead of below it.

Incidently, the blower is mounted before the HX because the warmer air from the HX would require derating of the motor if it were mounted after the HX.

Matt

Firedragon_4

Check this out too:

http://www.warmair.com/