Blower Door Kit

Blower Door Kit: Pro Airtightness Testing Made Simple

Vent Cap Systems™ supplies complete blower door kits built for energy auditors, HVAC contractors, and home-performance pros. Get fast setup, repeatable accuracy, and rugged durability—backed by U.S. calibration and expert support.

Extremely Durable & Field-Ready

Lightweight aluminum frames, reinforced panels, and high-duty fans are built for daily transport and tough job sites. These kits are designed to work as hard as you do.

Fast Setup. Accurate Results.

Precision gauges (DG-1000 or DM32X), color-coded tubing, and quick-fit frames reduce setup time and human error. Achieve stable pressures quickly and document airtightness with confidence.

Save Time & Lower Costs

Streamline envelope and duct testing together. Pair your blower door with Vent Caps™ and the Duct Ninja™ to eliminate disposable tape and finish jobs faster.

Better for the Environment

Reusable accessories and low-waste workflows reduce landfill impact and keep job sites clean. Fewer consumables, fewer headaches.

Safer for Technicians

Ergonomic frames, lighter fans, and organized carry cases improve handling and reduce fatigue. Smart layouts make solo setup practical and safe.

Patented Technology. Proven Accuracy.

Kits from The Energy Conservatory and Retrotec deliver calibrated performance verified to RESNET, BPI, and ASTM standards—trusted by programs and code officials nationwide.

What’s in a Typical Blower Door Kit?

  • Calibrated fan with flow rings
  • Adjustable door frame and durable panel (fits standard residential doors ~80" × 36" / 6 ft 8 in × 3 ft; 2032 × 914 mm)
  • Digital gauge (DG-1000 or DM32X), tubing, power leads
  • Carry cases and documentation
  • Optional software for guided tests and reports

Popular Kit Options

Recommended Add-Ons

  • Reusable Vent Caps — prevent duct leakage from skewing envelope results (tape-free).
  • Duct Ninja™ — fast return-air sealing under negative pressure.
  • Pole RAT™ — attach/remove Vent Caps from the ground; fewer ladder trips.

How Blower Door Testing Works

  1. Mount the adjustable frame and panel into an exterior doorway.
  2. Install the calibrated fan and connect the digital gauge.
  3. Pressurize or depressurize the building to a target pressure (typically 50 Pa).
  4. Record airflow and analyze leakage pathways; document with photos and reports.

Frequently Asked Questions

Which kit should I choose?

Single-family auditors often start with a standard-flow kit. Multifamily or commercial projects benefit from higher-flow fans or dual-fan setups. Contact us for a quick recommendation.

How often is calibration required?

Manufacturers recommend annual calibration for gauges and fans. We support U.S. service through The Energy Conservatory and Retrotec.

Can I test ducts and the envelope together?

Yes. Use a blower door for the building envelope and a duct tester for ducts. Reusable Vent Caps ensure clean, repeatable seals.

Do I need software?

Software speeds guided workflows, calculations, and reporting—especially helpful for program submissions and code officials.

Free Shipping Over $500

Bundle blower doors with duct testers and Vent Cap Kits and get free ground shipping on qualifying orders.

Equip your team with proven blower door kits and reusable sealing systems from Vent Cap Systems™. Save time, lower costs, and test with confidence.