A client had a new double wide set (27x56) in1997 a couple years later had an addition (27x20) to the west side with 27x20 attached garage to that addition, the general contractor tells the client a bigger furnace will be needed. He (general contractor) brings in his HVAC guy who installs a furnace clearly stamped "Installation for site built only", the front of the return box was hacked out to provide for a 16x20 filter plus the back has a run coming off of it into the master bed closet with a filter slot (no filter in place)down into the crawl and up into the wall cavities of the addition all metal return ducting uninsulated in crawl. The supply to addition comes off the original duct board below the furnace through the crawl to four insulated flex runs in addition and for some reason they insulated ,or tried to,  the metal ducting in addition crawl but not under manufacture home crawl and to make sure the owner got a good job the jumper duct was cut about four out from the furnace and left that way. The only thing I can come up with is they were going to tie into to the new heat run and forgot. So forget the general contractor, HVAC guy and last but not least the county inspector, so now what. As far as I'm concered that furnace has got to go and "Manufacture Home" approved installed, period. For the supply runs remove all that ducting, seal duct board back up and tie into bottom of original ducting at each west end run with insulated flex to existing boots, and naturally new jumper. I'm thinking the return in addition can go, the passage way to addition is over 8'. What are your thoughts, am I on the right track or in line with the three fore mentioned proffesionals. "The things that make your head go," BOOM ! " 

Views: 154

Reply to This

Replies to This Discussion

The manufacture home has higher SP ( rated Static Pressure) supply and no return  so some are rated to .8 to 1" in water vs most res are .5 in water.  Most Manufacture homes have a little room off the hall way  so the fan is a foot from door with wimpy filter.  Manufacture home have no branch duct just a 5" stream off the main trunk.     That's 2597 SF and Mob home air handler have higher efficiency  with smaller area,  With the transfer main trunk the efficiency just drops 10-15%

  Manufacture homes furnaces also take outside air on outside the flue pipe and have to buy the chimney from them.  When test system Efficiency (BTU in Vs BTU out) I get mid 40% on new and low 30% on old duct work.    To me it’s just temporally housing with high power bills.

RSS

Featured Forum Discussions

BPI Anaylist

Started by Larry R Waters in BPI 2 hours ago. 0 Replies

What causes a temperature plane in a home

Started by Energy Wise Solutions in HVAC. Last reply by Brad Cook 11 hours ago. 6 Replies

Velocity Pressure Testing

Started by Horace Douglas Hunt, Jr. in General Forum. Last reply by Horace Douglas Hunt, Jr. Apr 15. 2 Replies

Videos

  • Add Videos
  • View All

Latest Activity

Larry R Waters posted a discussion

BPI Anaylist

Industry leader in the north bay area California. Looking for experienced professionals and…See More
2 hours ago
Larry R Waters joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
2 hours ago
John Nicholas replied to Jim Fowler's discussion TREAT modeling of mid-rise apartments low heating load
"So why is tenant behavior significantly different in this building?"
3 hours ago
Jim Fowler replied to Jim Fowler's discussion TREAT modeling of mid-rise apartments low heating load
"Hi John - I'm strictly modeling the entire building, not individual units. I'm looking…"
4 hours ago
John Nicholas replied to Jim Fowler's discussion TREAT modeling of mid-rise apartments low heating load
"Where is this going?  Are you (the housing authority) trying to set the Utility Allowance?…"
8 hours ago
Brad Cook replied to Energy Wise Solutions's discussion What causes a temperature plane in a home
"It is interesting that people respond to questions like this with answers that make some…"
11 hours ago
Ed Minch replied to Energy Wise Solutions's discussion What causes a temperature plane in a home
"We see this in the mid-Atlantic with ceiling feeds on a hot air system, and usually with a…"
12 hours ago
North East Hydronic Radiant Inc posted photos
15 hours ago

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service