Wendes HVAC Estimating Blog

Construction Standards For HVAC Ductwork

Posted by joseph damelio on Fri, Apr 9, 2010

Wendes HVAC estimating software allows the estimator  to define duct  construction standards for rectangular, round and oval ductwork for positive or negative pressure classes up to 10" water gage. Ductwork construction standards to unlimited widths in gages 28 to 1/2" and diameters to 96" in gages 28 to 1/2" plate. HVAC duct construction standards are used in the software to accurately calculate material and labor for an estimate by specifying the various aspects of duct construction. SMACNA duct construction standards can be defined. Duct construction standards allow an estimator to  specify what gages, connections, reinforcing and tie rods are to be used for rectangular, round and oval duct.

The duct construction standards are broken down into five different types of ductwork. The ductwork types are specified as standard rectangular duct, spiral duct, oval, industrial and fiberboard. Within the duct construction standard an estimator can establish various water gage classifications from 1/2" to 10" positive or negative water gage. An estimator can establish a wide range of construction standards applicable to specific construction methods.  

Craig Raffaelli

Topics: Cost Estimating, HVAC Sheet Metal Labor Estimating

We Are Often Asked.....What Are HVAC Systems?

Posted by joseph damelio on Wed, Mar 24, 2010

HVACHVAC refers to an air system for heating and cooling in a commercial or residential building. The various components of HVAC systems include a heating furnace, a blower motor assembly, an evaporative coil, a compressor and compressor coil, and  the associated air ducts to distribute air within a building.


HVAC systems are designed to control humidity and circulate air in a building. There are various  types of HVAC systems and equipment used in commercial and residential applications. Some factors to be considerered in the design of HVAC systems include the flow rate and air pressure for the ventilation system. The air velocity and air pressure in a duct system is regulated by the duct size, duct type, fan size, fan velocity,grills, registers and air flow dampers that control air flow in the HVAC ventilation system.
HVAC Sheet Metal Estimating or HVAC Ductwork Estimating genarally refers to the material and labor cost estimates required to construct a heating and cooling ventilating system. All aspects of material and labor cost are itemized to determine the total cost estimate for the HVAC ventilating system. A comprehensive bill of materials based on specific design criteria and specifications for the HVAC system are produced with the associated labor cost for manufacturing and installing a system in a building.  


Topics: HVAC Sheet Metal Estimating, Cost Estimating, Labor Estimating