The Manual D is a complete schematic drawing of the duct system including locations and sizes of trunk-lines, branch ducts, outlet registers, and inlet grilles.

Remember, before any Manual D can be performed, you’ll first need the information calculated from Manual J software which will calculate all the factors and provide the sensible and latent capacity required to heat and cool the home. This capacity is then used to match a heating and cooling system which will produce the same capacity within tolerance.  This very important match-up is completed by utilizing the Manual S requirements. Once the equipment selection is completed, the duct work can now be designed using specific factors given to us by the equipment manufacture’s fan rating and pressure drop charts in which we can apply to your new duct design using Manual D requirements.

Getting a complete Manual-D done on your property plans is the best way to ensure that your heating and cooling system will deliver maximum comfort at high efficiency. It is the most recognized way to ensure that your system will be able to deliver the correct amount of air to each room.

Manual J Manual S