How do you calculate the area of a reduced duct?
The area of a Square = Length of Side x Length of Side. Example: Duct Size = 600mm x 600mm or 0.6m x 0.6m. Area of Duct = 360,000mm² or 0.36m².
What is the formula for calculating duct size?
To calculate the required equipment size, divide the HVAC load for the entire building by 12,000. One ton equals 12,000 BTUs, so if a house or office needs 24,000 BTUs, it will take a 2-ton HVAC unit. If you get an uneven number, such as 2.33 for a 28,000 BTU load capacity, round up to a 2.5-ton unit.
How do you calculate sqm for round duct?
How to Calculate Round Duct Area to Square Feet
- Measure the diameter of the round duct across its widest point.
- Divide the diameter by 2 to get the radius of the duct.
- Multiply the radius by itself to get the square of the radius.
- Multiply the square of the radius by 3.14 to get the area of the duct in square inches.
Can I make my ductwork smaller?
If the ductwork is in the way, you have three options. You can reroute it or split it into more but smaller ducts. But the least disruptive and easiest way is to replace the low ducts with new ducts that are flatter but wider. In most cases, you can gain several inches of headroom.
How many CFM does a 6 inch duct?
8-Inch Rectangular Ducts Size Chart (90-1,500 CFM)
| 6″ Duct | 6″ CFM |
|---|---|
| 6×8 | 160 CFM |
| 8×8 | 230 CFM |
| 10×8 | 310 CFM |
| 12×8 | 400 CFM |
Do 90 degree fittings restrict air flow?
The shape and curve radius of a PVC fitting makes a large difference in the resistance it creates to airflow. In reality a 90 degree elbow can have significantly less resistance than 6 feet and dramatically more than 6 feet depending on the shape of the elbow and the velocity of the air moving through the piping.
How to calculate the duct area of an elbow?
elbow formula: (width + height) x 2 x length x qty = area. length = (r+w/2) x 3.14 x (degree/180) taper formula: (width 1 + height 1+width 2+ height 2) x length x qty = area if up/down taper formula: (width 1 + height 1+width 2+ height 2) x (length + offset) x qty = area offset formula: (width + height) x 2 x (length + offset) x qty = area shoe
How to calculate friction loss in a duct?
1. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. 2. Read Friction Loss Per 100′ of duct (inches of water) and Duct Velocity (FPM). 1. Enter Duct Airflow (CFM), Duct Velocity (FPM), Duct Length and the number of bends.
How to calculate the area of a duct?
2 x ( (Area of Circle based on duct Width +150mm as Radius /4)- (Area of circle based on 150mm as Radius/4))+Height of duct x (2 xPi ()x (Duct width+150mm)/4)+ (height of Duct x 2x Pi ()x 150mm/4) the exact area in educational field is OK to calculate but in professional it is not like this
How are fittings used to reduce the size of a duct?
These fittings are used to reduce the size of the duct, change direction of the duct and offset past obstacles which may be in the path of the system. Measuring such ventilation systems for insulation and cladding requires skill and knowledge.