Installation Tips & Tricks — To cut flexible duct, use a steak knife from your kitchen drawer to cut through the outside jacket, fiberglass insulation and inner plastic core. Then cut the wire with a pair of wire cutters.

Simply so, How do you seal ductwork?

Duct joints should always be secured with #8 sheet-metal screws before seams are sealed with mastic. Sealing duct seams is messy work, so wear old clothes. The mastic is spread over duct seams with a disposable paintbrush, putty knife, or your fingers. (If you spread mastic with your fingers, wear rubber gloves.)

How do you insulate round ducts? If your round air ducts run below the joists, lay one insulation batt on top of the duct. Direct your helper to hold a second batt up to the underside of the duct. Wrap the twine snugly around the duct to hold the top and bottom insulation batts in place.

35 Related Questions Answers Found


Do I need air conditioning in my basement?

Even though the basement of a house tends to be much cooler than other floors due to its location virtually underground, lots of homeowners skip the air conditioning. Additionally, if you use your basement for storage and want to keep certain items protected, AC is a must.

How do you add dampers to HVAC?

Open up the duct work, and drill two holes on opposite edges of the tube. These holes should line up with the pre-drilled holes on the damper. Remove the fasteners from the damper, connect it to the duct through these holes and into the drilled holes, and tighten. Then, seal both sides with duct tape.

Can electrical wires touch ductwork?

It can‘t touch hot air ducts. Cold air ducts it can touch. The reason it cannot touch hot air ducts is because the heat derates the current carrying capacity of the conductor.

How do you heat and cool a finished basement?

Cooling options for a basement include: Upgrading your HVAC system. Getting a ductless mini split system. Buying a portable air conditioner.

The best heating options for a basement include:

  1. Extending or upgrading your existing HVAC system.
  2. Adding a fireplace.
  3. Installing radiant heat.
  4. Purchasing space heaters.

How do you install a flexible duct?

How to Install Insulated Flex Duct
  1. Measure the distance between the plenums or collars where the flexible duct installs.
  2. Roll back the plastic or foil jacket and the fiberglass lining approximately 8 to 12 inches from the inner core.
  3. Spread a thin layer of mastic glue onto the beaded end of the plenum or metal collar.

How do you vent a basement?

First, seal off all vents and close all windows. Then, install a plastic vapor barrier on the walls and floors in the basement or crawl space to keep moisture from passing through the concrete and entering into the space.

What is the maximum size of sheet metal that can be cut with tin snips?

Depending on the size of the blade, tin snips can cut between 24 and 16 gauge cold rolled low-carbon tin. They can be ranged in length from 7 to 14 in (180 to 360 mm) long. There are two main types: straight-pattern and duckbill-pattern.

What is a nibbler power tool?

How much does it cost to install HVAC in basement?

Of course, that’s going to depend on what HVAC work you need done. According to HomeAdvisor, the average complete HVAC installation cost in Connecticut can vary from $7,000 and up. We recommend getting a minimum of 3 quotes, before you choose an HVAC contractor. When choosing a contractor, do it wisely.

How do you install heat in a basement?

6 Keys to Warm Up a Cold Basement
  1. Address any water issues.
  2. Install TWO sump pumps.
  3. Choose inorganic materials.
  4. Capitalize on radiant heat.
  5. Use decorative concrete to your advantage.
  6. Put up radiant panels.
  7. Use our WarmlyYours Radiant Floor Heating Quote Builder to see how much a floor heating system would cost for your basement.

What is a duct knife used for?

For HVAC installers, the new duct knife is designed for cutting duct board, insulation and flex duct. The double edge blade allows the user to do all of these applications with one product. A full tang adds durability for tough cuts, and a durable sheath allows the user to store the knife safely between uses.

Where should ducts be located?

Ducts should always be located within the conditioned envelope of the building, ideally within the framing of floors, ceilings and walls, and they should be maintained so air does not leak out of or into them.

How do you measure a flex duct?

One simply needs a ruler or measuring tape along with the end of the hose or outlet. Keep in mind that you have to begin the measurements from the interior wall of the circle. The distance to the opposing point of the circle is the measure of the flex duct sizing for the inner diameter.

How many cold air returns do I need in my basement?

I recommend that all basements should have at least 2 supply registers and 1 return register in the basement/equipment area just to keep that area slightly warm or cool and the air fresh. If you are going to finish that area to be used as living space, then more supply and returns will be needed.

DEAR TIM: Ideally you want to have cold air return registers in every room. If you can’t easily install a true cold air duct back to the furnace from each room, you can sometimes fake it. You can install a cold air return register above the door from each room that connects to the hallway.

Insulate the Ducts

You can minimize this problem by either insulating the entire space the ducts pass through or by insulating the duct itself. When dealing with attic ductwork, it is often helpful to install radiant barrier foil to prevent the attic turning into a hotbox during the day.

How do you offset a square duct?

How to Make a Ductwork Offset
  1. Step 1: Measure the Offset Distance. Place a straightedge on the obstacle and extend it in the direction of the straight run of ductwork, parallel to it.
  2. Step 2: Measure the Offset Length.
  3. Step 3: Calculate the Offset Angle.
  4. Step 4: Prepare the Offset Duct.
  5. Step 5: Cut the Angles.
  6. Step 6: Connect the Offset.

Can you run ductwork through floor joists?

Here’s a joist cavity being used as the main return duct. This is also the location of the air filter. This is a panned floor joist cavity being used as supply duct. Drainpipes should not pass through ductwork.

Should return vents be high or low?

High return registers draw hot air that rises to the ceiling back into the system to repeat the cooling cycle. Without high registers, your home’s low-level registers will draw cooler air back to the system, and your rooms will be left with the warm air at the ceiling.

What do you use to cut ductwork?

Straight-cutting compound snips work best for cutting thick or doubled-up sheet metal. They don’t cut curves well. There are two ways to cut round ducts. First, if you want to cut a duct near the middle and use both ends, mark and cut the duct before snapping it together.

How do you move an HVAC vent?

How do you cut spiral ducts?

Apply light pressure to the grinder, and cut through the spiral pipe. Holding the grinder in place, slowly spin the spiral pipe to perform the cut. Hold the spiral pipe in place, and slowly move the grinder along the line when you reach the thick rib that holds the spiral pipe together.

How do you move ductwork to knock down a wall?

Detach the connection where the flexible duct meets the circular end of the rigid duct. To do this, cut away any duct tape with a utility knife, then loosen and remove the duct screws. Pull the section of rigid duct out of the wall. Save this piece.

How do I run new ductwork?

  1. prev. fan draws air from house into system. gas burners create heat in heat exchanger.
  2. prev. attach takeoff to main supply line.
  3. prev. install ceiling register boot.
  4. install damper into duct. Install the Damper.
  5. add a couple of support brackets. Add Support Brackets and the Register.
  6. prev. install cold air return.

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 much does it cost to move ductwork?