Corey Breed, Vent Cap Inventor, is applying the new patent pending Duct Ninja;
Duct Ninja™ Return Grille Seal for Duct Leakage Testing
Corey Breed, Vent Cap Inventor, is applying the new patent pending Duct Ninja;
Duct Ninja™ Return Grille Seal for Duct Leakage Testing
Duct Ninja™ Return Grille Seal for Duct Leakage Testing

Duct Ninja™ Return Grille Seal for Duct Leakage Testing

$ 650.00
$ 650.00
Description
Description
x

What it is

The return grille is the part that slows you down.

Supply registers are easy — a Vent Cap goes on in seconds. The return is where the job stalls: haul the ladder in, climb up, hold the flange against the ceiling, tape around a large opening, hope the adhesive grabs on dusty or textured drywall, then pull it all off and throw it away.

The old routine

  • Carry a ladder room to room
  • Climb up and down repeatedly
  • Hold a flange overhead by hand
  • Apply square feet of tape or Grill Mask
  • Hope adhesive sticks to texture, dust, or fresh paint
  • Strip everything off and throw it in the truck
  • Buy more tape for the next house

The Duct Ninja routine

  • Lift the frame to the return from the floor
  • Start the duct tester
  • Airflow makes the seal — not adhesive
  • Run the test
  • Lower it, fold it, load it
  • Use it again tomorrow
  • Buy no tape at all

How it works

Six steps. No adhesive anywhere in the process.

The Duct Ninja doesn't rely on tape sticking to drywall, paint, dust, texture, or the grille itself. The duct tester creates the force that holds the seal.

Seal the supplies

Cap the supply registers as you normally would.

Connect the tester

Attach your duct tester's flex duct to the Duct Ninja flange.

Raise it

Lift the frame to the return grille on a threaded painter's pole — feet on the floor.

Depressurize

Start the duct tester and pull the system negative.

The seal forms

Airflow draws the Ninja Skin™ tight into the grille and holds it there.

Run the test

Take your reading, lower it, fold the frame, move on.

Important: The Duct Ninja™ is designed primarily for negative-pressure / depressurization duct leakage testing. It seals by using airflow to pull the Ninja Skin™ into the return grille.

See it work

Choose a video

Open any video below and it will play right here on the Duct Ninja™ product page.

1. First Demo — Concept OverviewEarlier frame design
2. Skip Straight to the SealStarts at approximately 1:21
3. Ninja Placed with Fan Already RunningStarts at approximately 6:17
4. Unboxing & Setup — Current REV3Current REV3 walkthrough, starting at 0:02

Tape vs. Duct Ninja

Same test. Different day.

Tape & plastic Duct Ninja™ REV3
Sealing the return Ladder, climb, hold, tape Raise it from the floor on a pole
What holds the seal Adhesive on drywall, paint, and dust Negative pressure from the duct tester
Textured ceilings Adhesive frequently fails Surface texture is irrelevant
Cost per test Tape and plastic consumed every time Zero consumables
After the test Strip it off, residue, throw it away Fold the frame, pack it, reuse it
In front of the customer Plastic sheeting and tape rolls A clean, professional instrument

What changed in REV3

Rebuilt from field feedback

Folding frame

Three corners are permanently hinged — faster to open, easier to store. Use the friction-fit corner for folding storage or the locking corner to leave it assembled.

No corner screws

Friction-hold components replace the original thumbscrews. Fewer loose parts to drop in an attic, and a faster setup between tests.

Full-strength Ninja Skin™

A more durable, reusable sealing membrane with improved retention and a center support beam for rigidity. Standard threaded pole mount.

I may have repeated the same mistake I made with Vent Caps: I built it too well. Some customers are still using Vent Caps they bought more than a decade ago. Bad for repeat sales — excellent for you. — Corey Breed, inventor

Field feedback

From testers running it on real jobs

★★★★★

“The new cloth works 100 times better than the original. We don't even use the clips anymore. We've run about 10 tests since the update and everything works great.”

Maria WestOwner, Blower Door Queen — FL
★★★★★

“The new setup worked great. It was significantly less leakage than tape. It sucked right up to the return grille.”

Brett WhiteSouthern Valley Services — AL

Built for

Who's using it

  • HERS raters
  • Home-performance contractors
  • Weatherization programs
  • HVAC testing companies
  • Energy auditors and BPI professionals
  • Multifamily testing crews
  • Anyone running total duct leakage or leakage-to-outside tests

In the box

What's included

  • REV3 folding frame — three hinged corners, friction-fit closing components, locking-corner option
  • Full-size Ninja Skin™ sealing membrane
  • Duct-tester flange
  • Central support beam
  • Pole-mount attachment and sliding skin retainers
  • Assembly and setup video access
  • No Version Regret Protection

Duct tester and painter's extension pole sold separately.

2 Future revisions covered

No Version Regret Protection

Buying an evolving product raises a fair question: what happens when Corey improves it again?

Full-price Duct Ninja purchases include update parts for up to two future revisions that materially improve the durability or core performance of the product. When a qualifying improvement ships, the update parts come to you.

You're not being punished for buying early. You're helping make the product better.

Questions

Before you order

Does it work for pressurization testing?

The Duct Ninja™ is designed primarily for negative-pressure / depressurization duct leakage testing. The seal is formed by airflow pulling the Ninja Skin™ into the return grille, so depressurization is what holds it in place.

What if the house has multiple returns?

The Duct Ninja connects the duct tester and seals one primary return. For additional returns up to roughly 14", a Large Vent Cap (≈16.5" of usable sealing area inside the gasket) is often the simplest solution. For larger secondary returns, a second frame can be used with a blank Ninja Skin™ and no flange. Contact us before ordering if your returns are unusually large or the property has several.

How large a grille will it cover?

It covers most standard residential return grilles. Coverage on oversized grilles is the one limitation testers have reported — not seal failure. Larger frame configurations are being evaluated based on current field feedback. Call us with your dimensions and we'll tell you straight.

Do I need a special pole?

No. The REV3 pole mount accepts common threaded painter's extension poles. The pole is sold separately.

Is it compatible with my duct tester?

Yes — the flange connects to standard duct testing flex duct, including the Minneapolis Duct Blaster® and Retrotec DucTester®.

It's still being field validated. Is it ready?

It's working on real jobs today. A Duct Ninja™ Field Validation Group of HERS raters, auditors, weatherization pros, and HVAC testing companies is actively hunting for weaknesses so the tool keeps improving. The goal isn't compliments — it's a field tool experienced testers can rely on. That's exactly what No Version Regret Protection exists to cover.

Stop buying tape to perform the same test again.

Seal the return from the floor. Let negative pressure do the holding. Finish the test. Pack it up and use it again.

Choose your quantity and add the Duct Ninja™ to your cart above.

Patented · Reusable · Built by an HVAC contractor · Free shipping over $500

Read More
Shipping & Return
Shipping & Return
x

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

What it is

The return grille is the part that slows you down.

Supply registers are easy — a Vent Cap goes on in seconds. The return is where the job stalls: haul the ladder in, climb up, hold the flange against the ceiling, tape around a large opening, hope the adhesive grabs on dusty or textured drywall, then pull it all off and throw it away.

The old routine

  • Carry a ladder room to room
  • Climb up and down repeatedly
  • Hold a flange overhead by hand
  • Apply square feet of tape or Grill Mask
  • Hope adhesive sticks to texture, dust, or fresh paint
  • Strip everything off and throw it in the truck
  • Buy more tape for the next house

The Duct Ninja routine

  • Lift the frame to the return from the floor
  • Start the duct tester
  • Airflow makes the seal — not adhesive
  • Run the test
  • Lower it, fold it, load it
  • Use it again tomorrow
  • Buy no tape at all

How it works

Six steps. No adhesive anywhere in the process.

The Duct Ninja doesn't rely on tape sticking to drywall, paint, dust, texture, or the grille itself. The duct tester creates the force that holds the seal.

Seal the supplies

Cap the supply registers as you normally would.

Connect the tester

Attach your duct tester's flex duct to the Duct Ninja flange.

Raise it

Lift the frame to the return grille on a threaded painter's pole — feet on the floor.

Depressurize

Start the duct tester and pull the system negative.

The seal forms

Airflow draws the Ninja Skin™ tight into the grille and holds it there.

Run the test

Take your reading, lower it, fold the frame, move on.

Important: The Duct Ninja™ is designed primarily for negative-pressure / depressurization duct leakage testing. It seals by using airflow to pull the Ninja Skin™ into the return grille.

See it work

Choose a video

Open any video below and it will play right here on the Duct Ninja™ product page.

1. First Demo — Concept OverviewEarlier frame design
2. Skip Straight to the SealStarts at approximately 1:21
3. Ninja Placed with Fan Already RunningStarts at approximately 6:17
4. Unboxing & Setup — Current REV3Current REV3 walkthrough, starting at 0:02

Tape vs. Duct Ninja

Same test. Different day.

Tape & plastic Duct Ninja™ REV3
Sealing the return Ladder, climb, hold, tape Raise it from the floor on a pole
What holds the seal Adhesive on drywall, paint, and dust Negative pressure from the duct tester
Textured ceilings Adhesive frequently fails Surface texture is irrelevant
Cost per test Tape and plastic consumed every time Zero consumables
After the test Strip it off, residue, throw it away Fold the frame, pack it, reuse it
In front of the customer Plastic sheeting and tape rolls A clean, professional instrument

What changed in REV3

Rebuilt from field feedback

Folding frame

Three corners are permanently hinged — faster to open, easier to store. Use the friction-fit corner for folding storage or the locking corner to leave it assembled.

No corner screws

Friction-hold components replace the original thumbscrews. Fewer loose parts to drop in an attic, and a faster setup between tests.

Full-strength Ninja Skin™

A more durable, reusable sealing membrane with improved retention and a center support beam for rigidity. Standard threaded pole mount.

I may have repeated the same mistake I made with Vent Caps: I built it too well. Some customers are still using Vent Caps they bought more than a decade ago. Bad for repeat sales — excellent for you. — Corey Breed, inventor

Field feedback

From testers running it on real jobs

★★★★★

“The new cloth works 100 times better than the original. We don't even use the clips anymore. We've run about 10 tests since the update and everything works great.”

Maria WestOwner, Blower Door Queen — FL
★★★★★

“The new setup worked great. It was significantly less leakage than tape. It sucked right up to the return grille.”

Brett WhiteSouthern Valley Services — AL

Built for

Who's using it

  • HERS raters
  • Home-performance contractors
  • Weatherization programs
  • HVAC testing companies
  • Energy auditors and BPI professionals
  • Multifamily testing crews
  • Anyone running total duct leakage or leakage-to-outside tests

In the box

What's included

  • REV3 folding frame — three hinged corners, friction-fit closing components, locking-corner option
  • Full-size Ninja Skin™ sealing membrane
  • Duct-tester flange
  • Central support beam
  • Pole-mount attachment and sliding skin retainers
  • Assembly and setup video access
  • No Version Regret Protection

Duct tester and painter's extension pole sold separately.

2 Future revisions covered

No Version Regret Protection

Buying an evolving product raises a fair question: what happens when Corey improves it again?

Full-price Duct Ninja purchases include update parts for up to two future revisions that materially improve the durability or core performance of the product. When a qualifying improvement ships, the update parts come to you.

You're not being punished for buying early. You're helping make the product better.

Questions

Before you order

Does it work for pressurization testing?

The Duct Ninja™ is designed primarily for negative-pressure / depressurization duct leakage testing. The seal is formed by airflow pulling the Ninja Skin™ into the return grille, so depressurization is what holds it in place.

What if the house has multiple returns?

The Duct Ninja connects the duct tester and seals one primary return. For additional returns up to roughly 14", a Large Vent Cap (≈16.5" of usable sealing area inside the gasket) is often the simplest solution. For larger secondary returns, a second frame can be used with a blank Ninja Skin™ and no flange. Contact us before ordering if your returns are unusually large or the property has several.

How large a grille will it cover?

It covers most standard residential return grilles. Coverage on oversized grilles is the one limitation testers have reported — not seal failure. Larger frame configurations are being evaluated based on current field feedback. Call us with your dimensions and we'll tell you straight.

Do I need a special pole?

No. The REV3 pole mount accepts common threaded painter's extension poles. The pole is sold separately.

Is it compatible with my duct tester?

Yes — the flange connects to standard duct testing flex duct, including the Minneapolis Duct Blaster® and Retrotec DucTester®.

It's still being field validated. Is it ready?

It's working on real jobs today. A Duct Ninja™ Field Validation Group of HERS raters, auditors, weatherization pros, and HVAC testing companies is actively hunting for weaknesses so the tool keeps improving. The goal isn't compliments — it's a field tool experienced testers can rely on. That's exactly what No Version Regret Protection exists to cover.

Stop buying tape to perform the same test again.

Seal the return from the floor. Let negative pressure do the holding. Finish the test. Pack it up and use it again.

Choose your quantity and add the Duct Ninja™ to your cart above.

Patented · Reusable · Built by an HVAC contractor · Free shipping over $500

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