Please read the entire page for the best result, which is a perfect fit, FAST, & the first time!
The RIGHT questions to ask:
- Is the roof top unit that I am replacing installed on the original curb that is roofed into the building?
- If so, is the make and model of the unit present and legible? Please provide this information if available.
- If not, and the unit being replaced is on an adapter curb, is there an identifier plate present on the adapter, and is it legible? Please provide this information if available.
At times, there is no information to be found on the unit, or on an existing adapter curb. In this case, please fill out our field verification form, which can be found here. Please be sure to fill out the entire form, and to identify supply and return. We cannot build your adapter curb without this!
First & Foremost! Please take pictures and send them to us! Pictures really are worth a thousand words, and in this business, can be worth thousands of dollars! There is no such thing as too much documentation.
DO NOT measure the unit or the unit's base rail! In most cases, the roof top unit base rail seats down around the original roof curb, naturally making the unit larger than the roof curb itself. Instead, measure the highest point of the roof curb that is roofed into the building, or right below the unit base rail. Most often there will be a turned out flange or metal flashing strip installed here. Also be sure to measure the supply and return duct openings in the curb BELOW the unit, NOT THE UNIT PAN OPENINGS! Many times the unit openings are smaller than the actual duct below.