The Retrotec FlowBox
Exhaust Fan Flow Meter & Pressure Pan
The Retrotec FlowBox is a passive exhaust fan flow meter designed to work seamlessly with a digital manometer, delivering precise exhaust-only flow measurements. Whether you’re testing bathroom fans, kitchen exhausts, room returns, or whole-house ventilation systems, the FlowBox ensures reliable results with ease.
Why Choose the FlowBox?
Unlike other exhaust fan flow meters, the FlowBox is built for versatility, durability, and convenience. It features the same range plug system found in our DucTesters and Model 5000/6000 blower doors, making it an intuitive addition to any testing setup.
With all range plugs installed, the FlowBox doubles as a pressure pan—no tape required—for locating leaks with a blower door.
Key Features
- Dual-Purpose Functionality – Use it as a pressure pan with a blower door—no tape needed, making it the only exhaust fan flow meter with this capability.
- Large Coverage Area – Measures larger bath fan models, even those with light assemblies, thanks to its 16.5” x 16.5” x 8” dimensions.
- Built for Longevity – Made from extra-durable plastic to withstand everyday use.
A Smarter, Stronger Flow Meter
Whether you need precise flow measurements or a hassle-free pressure pan, the FlowBox is the only tool that does both—without compromise.
A sticker attached on the side of the FlowBox (also shown below) indicates the effective open area you’ll need to enter into the DM32X, DM32, or DM2 gauge for the selected ranges and flow capacities. Important: Adjust the hole configuration until Channel A on DM32 reads between -1 & -10 Pa. Place firmly to ensure a tight seal.
FlowBox Flow Ranges
* Table Denote Flow Rates in Cubic Feet Per Minute (CFM)
** +/- 10% Accuracy. Effective area values were determined by using NIST traceable equipment on a flow chamber.
Standard
Ranges |
Effective Area
(sq in) |
Effective Area
(sq cm) |
Min Flow (CFM) |
Max Flow (CFM) |
| 4 Openings |
62 |
400 |
62 |
205 |
| 3 Openings |
50 |
322 |
50 |
149 |
| 2 Openings |
34 |
219 |
34 |
105 |
| 1 Opening |
18 |
116 |
18 |
54 |
| 74 Plug |
9 |
58 |
9 |
28 |
|
|
|
|
|
Experience precision and adaptability with the Solo Single Channel Manometer. This cutting-edge digital gauge is accurate and versatile, all while maintaining affordability.
The Solo boasts exceptional accuracy, providing measurements with precision up to 1/100th of a Pa. It utilizes the same digital sensor and filtering technology as our DM32X and features auto-zeroing technology for hassle-free operation.
Adjust Time Averaging directly from the gauge itself, eliminating the need for complicated app pairing.
A Responsive Display Screen quickly changes directions when maneuvering the gauge from Landscape into Portrait mode.
Charging is a breeze with two hour fast charging via USB-C.
In most cases, an app isn’t required when this tool is used. Therefore, wireless connectivity is not included, only high-precision readings. This keeps the cost down and makes it the perfect tool to introduce HVAC contractors to home performance.
For Energy Auditors, the Solo pairs effortlessly with a running blower door. Connect the gauge to a Mini Probe or Pressure Pan & efficiently detect / pinpoint external air leaks, enhancing your energy audit capabilities.
Easily switch between units of measurement: change from measuring “Pascals” to “Inches of Water Column” when assessing static pressure, making it a valuable tool for HVAC diagnostics.
Upgrade your measurement precision with the Solo Single Channel Manometer: the essential tool for professionals seeking the highest standards of accuracy and flexibility.
Reviews
There are no reviews yet.