Ac Duct Sizing Chart

It s often in the neighborhood of 1 ton of air conditioning capacity for each 600 square feet of conditioned floor area usually abbreviated 600 sf ton.

Ac duct sizing chart. Duct design 5 sizing the ducts. A little under sizing or over sizing is fine just don t over size by more than about 20 of your heating requirement or short cycling can occur which wastes energy and reduces your comfort if you re still unsure which system size is right for you please e mail us or call our toll free number at 1 866 862 8922. Mechanical sizing name of contractor designer address permit phone fax lot.

Because of this hvac professionals and amateurs alike typically don t calculate the final hvac ducting size by themselves. The new chart removes tl1 s incon istency while incorporat ing the eco nomic paramt l1 in the initial sizing of the duct. You can use our climate based sizing chart to get an idea of sizing based on your climate.

The default values are for air flow 400 cfm 680 m 3 h duct size 8 in 200 mm and velocity 1150 fpm 5 8 m s. With the enhanced friction chart after the flow rate and eco nomic facto are fixed the size is also fixed al a unique value this is subject to minor errors caused by the reading of the diameter from the chart. Attach at a minimum a one line diagram showing the duct system with fittings sizes equivalent lengths through fitting and duct lengths.

Turbulence drawing from acca s understanding the friction chart which apparently is no longer available. Download and print air ducts velocity diagram. To size your mini split air conditioner the most important thing you need to know is the square footage of the room you re looking to cool and or heat.

Each indoor unit will be capable of providing a set number of btu s of cooling and heating power. I am having ac work and new flex duct system run off a main hard board plenum that comes up into the attic out of the ac unit closet. Understand here that the standard practice among hvac contractors sizing air conditioners for new homes is to use a rule of thumb.

One of the first things i do is to apply my rule of thumb. Dual zone mini split systems. Dual zone mini split systems consist of one outdoor air conditioner or heat pump two indoor air handlers and an installation kit for each air handler.

We suggest that you complete a load calculation on your home or that a local contractor visit you to provide a detailed analysis for proper sizing of both the heat pump and supplemental heating. In order to size your mini split correctly you will need to know the square footage of the room and check it against our table. The rate to be used with a duct calculator or a friction chart for the duct design on this project.