HEATING AND VENTILATING SYSTEM
95. Heating and ventilating work should be estimated as indicated in the following paragraphs:
Estimate all pipes and fittings the same as for plumbing. Sum up all standard radiators, and the price per square foot of radiation. Figure special radiators separately.
Itemize all valves, air vents, hangers, etc.
Estimate on pipe coverings by linear foot.
Estimate sheet-metal, indirect-radiator casings in pounds.
Estimate sheet-metal flues and smoke pipes by the linear foot; but estimate elbows and dampers separately.
Estimate register boxes, registers, and borders separately.
Make separate items of expansion tanks, hot-water damper regulators, and furnace regulators.
Figure heaters, steam boilers, and furnaces from manufacturers’ catalogs.