Suburban Furnace Question
I have a Suburban Furnace Model SF-30F. Since I've owned my 5er, it's never really put out a lot of hot air from the floor vents. A few years ago, I pulled off the return grill and found the maj...
Forum Discussion
first let me thank all of you for the responses and letting me know i'm on the right track.
@KTMRFS - when we first got the rig, the flexible duct (as you described) was punctured by an overly aggressive wife who wanted her chairs to stack in a certain way. I did exactly what you suggested - right pipe with insulation around it. Alas, no difference - but you and I were/are thinking along the same line.
@Stircrazy - i have a 2" output pipe that blows under the rig to protect the tanks. I went so far as to cap it off to see if it made a difference - it didn't. Again, you and I were thinking the same thing.
@Opnspaces - I can't access the plenum. It's sandwiched between the linoleum (on top) and a piece of wood underneath the plenum. based on the leakage my AC has - I'll bet the thin aluminum tape they used to seal the sections together are torn and leaking, badly. Unfortunately, I can't access the plenum (based on some youtube videos of how the coaches are built today.
I think, and that was my question regarding the sq. inches of ducting - that my best result is to open three 4" ducts into a single plenum - either 6 or 8" which is much more than required (56 sq inches), and split it off into 3 4" ducts. One for the upper area - two for the lower.
But, I think I'm going to have to go under the coach to feed the two vents that exist - cut through the floor plenum and bypass it completely.
The good news they are standard 4x10 vents so the big box stores all stock the standard duct work. I can probably find insulated pipes as well which will retain more of the heat (when I need it).
One thought is that I can use those Dryer vents (4" round to a square body and then back to a 4" round) and if I use a couple of those, I can connect those into a larger duct - but since they are facing the inside of the rig I don't have enough room for 2 4" round ducts.
Again, if my math is correct ,as long as the total number of sq inches equal the manual (36 sq inches for 3 4" ducts) then I should be able to imagineer this together and still be within manufacturer specs.
Does anyone see anything wrong with my math?
Thanks so much!
josh
@KTMRFS - when we first got the rig, the flexible duct (as you described) was punctured by an overly aggressive wife who wanted her chairs to stack in a certain way. I did exactly what you suggested - right pipe with insulation around it. Alas, no difference - but you and I were/are thinking along the same line.
@Stircrazy - i have a 2" output pipe that blows under the rig to protect the tanks. I went so far as to cap it off to see if it made a difference - it didn't. Again, you and I were thinking the same thing.
@Opnspaces - I can't access the plenum. It's sandwiched between the linoleum (on top) and a piece of wood underneath the plenum. based on the leakage my AC has - I'll bet the thin aluminum tape they used to seal the sections together are torn and leaking, badly. Unfortunately, I can't access the plenum (based on some youtube videos of how the coaches are built today.
I think, and that was my question regarding the sq. inches of ducting - that my best result is to open three 4" ducts into a single plenum - either 6 or 8" which is much more than required (56 sq inches), and split it off into 3 4" ducts. One for the upper area - two for the lower.
But, I think I'm going to have to go under the coach to feed the two vents that exist - cut through the floor plenum and bypass it completely.
The good news they are standard 4x10 vents so the big box stores all stock the standard duct work. I can probably find insulated pipes as well which will retain more of the heat (when I need it).
One thought is that I can use those Dryer vents (4" round to a square body and then back to a 4" round) and if I use a couple of those, I can connect those into a larger duct - but since they are facing the inside of the rig I don't have enough room for 2 4" round ducts.
Again, if my math is correct ,as long as the total number of sq inches equal the manual (36 sq inches for 3 4" ducts) then I should be able to imagineer this together and still be within manufacturer specs.
Does anyone see anything wrong with my math?
Thanks so much!
josh
