Thanks in advance for your replies.
A little background on what we have to work with..
The local American Legion building has been erected in a number of builds throughout the years. It started with a 30' x 30' building (this is the kitchen area) with windows that fold out to serve food at our annual community picnic. At some point the members added an additional 50' of pole barn to one end of the building (this is storage only). A number of years later they added another 100' long pavilion to the other end of the building and at some point this was enclosed (this is the commons area). We now have a building that is 180' long x 30' wide with ceilings that are 7 1/2 ' high. A few years back the Legion hired a contractor to come in and blow cellulose insulation into the walls and attic spaces of the kitchen and common areas. The current furnaces (2) are ancient down draft units that a member of the community donated when he upgraded the units in his home. A volunteer heating/cooling contractor placed the units along the walls inside the commons area of the building with the duct work running along the floor by main walls where seating should be located (the duct work sticks out 2' from the walls and 8" high).
My questions are these ..
We would like to place one or two up draft furnaces in the storage unit mentioned above with flexible duct work running thru the rafters of the attic to heat both the kitchen and commons area... the heated area will be 130' x 30' x 7 1/2' .. (approximately 30,000 cubic feet)
Because the building is so long and narrow with low ceilings, can one furnace heat the entire place comfortably? If we use one unit, should the contractor that we hire make the duct work diameter get smaller as he gets closer to the far end of the building (I saw this in the open ceiling of a local gas station)? Should we run 2 units with each heating a different end of the building and being controlled by a thermostat on that respective end of the building? Should we run 2 units with duct work side by side the length of the building? What size unit or units should we be trying to locate?
We have the opinion of a member that is an HVAC contractor, but the rest of the membership has a different opinion.