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What else can I help you with?
Why the return duct of AHU is larger than supply duct?
The air is returning at a lower velocity, so you need a larger size duct.
To increase air flow between rooms should vent be installed on the upper or lower part of a door?
It depends. If your bedroom has a supply AND return duct, then no. If there is only a supply duct, and you shut your bedroom door, this pressurizes the bedroom and limits the CFM delivered into the bedroom. A room to room vent or duct would equalize this pressure and allow maximum CFM to be delivered from the central air/heat system.
What is the R value of duct board?
1" Duct Board has an R-Value of 4.3
How do you seal duct vents?
With duct tape I install and maintain duct work for a living if you want to seal the joints just wrap the tape around the duct. If you need to cover a hole you will need to screw a piece of metal on the duct over the hole and tape over the edges of your patch. this is the simplest and cheapest way I know to do it.
What kind of a system is ductwork?
Ductwork is simply a duct system. Ducts are essential to the circulation of air, and ductwork describes a range of duct related fields, such as duct design.
Why the return duct of AHU is larger than supply duct?
The air is returning at a lower velocity, so you need a larger size duct.
What vessel does lymph from the left arm return to the heart through?
Thoracic duct
How do you calculate duct size with area given?
if the area given is 100 square inches you can use 10" by 10" duct due to a black art known as aerodynamics or compressible fluid flow, you will get the same back pressure in a 10" diameter round duct and a 2" x 50" duct considerably more back pressure a nice manufactured 90 will take as much back pressure as 50' of duct a tight curved 90 will take as much as 100 feet of duct fans have a curve that goes from maximum cfm at no pressure to minimum cfm at max pressure the fan will require the most power when cfm * pressure is highest simple as rocket science i guess
What is up stream pressure?
The upstream pressure is the pressure in a pipe or duct on the inlet side of a piece of mechanical equipment.
What is external static pressure in your duct?
It is nothing but losses inside duct due to pressure already present in ducts/pipe. It is measured in Pascal, Inch of water etc. High static pressure will resist the fluid to flow.
How is it possible that my heater is on and hot air is coming out of my vents but even with the filter removed nothing is being sucked through the return like it used to?
Did you add more returns? If so there is your answer. When the return duct is sized properly, there is minimal negative static pressure or sucking.
How much pressure does it take to break a strip of duct tape?
The pressure required to break a strip of duct tape can vary depending on the brand and thickness of the tape. In general, duct tape is designed to withstand high levels of pressure and can typically withstand forces of 20-40 pounds per square inch before breaking.
What is pressure loss?
decrease in pressure from one point in a pipe or a duct to another point downstream of the fluid flow. It is due to frictional forces on a fluid that flow through a pipe or a duct
What is the recommended return duct size for optimal air circulation in a residential HVAC system?
The recommended return duct size for optimal air circulation in a residential HVAC system is typically around 1 square foot of duct area for every 1 ton of air conditioning capacity.
Why is the intake grill of your home air conditioner blowing cold air?
A supply duct connected to the return duct somewhere? Fan running backwards?
What size duct for cold air return for 3 ton unit?
A 16" round flex duct will accommodate up to a 3.5 ton unit
How fast does air with a velocity pressure of 0.20 in w.g. move through square duct?
The velocity pressure can be used to calculate the velocity of air in the duct using the formula: velocity = √(2 * pressure / air density). Assuming standard air density and converting 0.20 in w.g. to the appropriate pressure unit, the velocity of air in the duct would be approximately 903 ft/min.
