What is black iron ductwork?

Black Iron Grease duct is fabricated to safely transfer contaminated air, grease vapors, and heat. In a commercial kitchen, grease is heated to its vaporization point. Vapors then cool, condense and settle on colder surfaces. This produces a highly flammable hydrocarbon which can be very dangerous.

Is ductwork made of tin?silicone molding company

Traditionally, air ductwork is made of sheet metal which was installed first and then lagged with insulation. Today, a sheet metal fabrication shop would commonly fabricate the galvanized steel duct and insulate with duct wrap prior to installation.

What is a rigid duct?

Rigid ducts, or spiral ducts, are metal pipes used in permanent ventilation, heating and air conditioning systems, as well as large-scale dust and exhaust extraction plant. Rigid ductwork is versatile and can be adapted to a wide variety of purposes and building layouts.

What is flexible ductwork made of?

Flexible HVAC Ductwork

This type of ductwork is usually tube shaped and is made from a wire coil covered in a bendable but durable plastic. Manufacturers then cover the tube in fiberglass insulation.

What is the good rule of thumb in sizing ductwork?

In the simplest of terms, the rule of thumb states – for every 500 square feet of air-conditioned floor area install an AC of one-tonne capacity. Why Does Duct Size Matter? One thing pretty clear is that you need to have appropriately sized ducts for the HVAC to work effectively.

Does duct length affect cfm?

Excessive Length

Longer ducts can increase the size of sheet metal ductwork fabrication the air handler needed to supply the same cubic feet per minute (cfm), or the HVAC system may not be able to supply the designed cfm to all locations.

How far can you run 6 round duct?

When you go from 6″ round to 6″ oval, you get 110′ of equivalent length. Wow! That means that a fitting that is somewhere around 1′ in actual length reduces the air flow as much as 110′ of straight 6″ duct.

How many CFM can a 4 inch round duct handle?

Reviewing the chart, a 4” pipe will convey 395 CFM at 4500 FPM. This means that a 4” pick-up on a machine will use 395 CFM from the filtering system; or, if you know that a machine will require approximately 400 CFM to remove the waste, you should use a 4” pipe for that purpose.

How far can you run ductwork?

If you choose well, you can be at 10 or 20 feet of effective length. If you choose that smooth mitered elbow, however, you end up with 75 feet.

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