Customer Service (512) 650-VENT





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.
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.
Tight ducts need a smaller hole. Retrotec's 4" (10 cm) range plugs restrict the DucTester fan inlet so it can measure low airflow accurately. When a duct system is too tight for your current plug, the gauge shows "--" instead of a number. The right range plug turns that dash into a passing result.
Genuine Retrotec parts. Push-in fit, durable, nothing to adjust. Check the fan series before you order: Range 74, 47 and 29 fit the residential US340x (300-series fan). Range 18 and 11 are for Retrotec's 400-series commercial DucTesters (US440x / US450x).
| Range plug | Part # | Fits | Best for |
|---|---|---|---|
| Range 74 | RP074 | US340x (standard in kit) | Most systems: start here |
| Range 47 | RP047 | US340x (standard in kit) | Typical new construction |
| Range 29 | RP029 | US340x (optional add-on) | Tight ducts, small systems |
| Range 18 | RP018 | 400-series commercial (US440x / US450x) | Tighter systems on commercial DucTesters |
| Range 11 | RP011 | 400-series commercial (US440x / US450x) | Very low flows on commercial DucTesters |
Not sure which fan you have? The model number is on the fan label, or call (512) 650-VENT and we'll confirm before you order.
Your US340x ships with Range 74 and 47. If you're testing new homes built to modern code, multifamily units or small systems, Range 29 is the plug most raters add first.
Make setup as fast as the test. Seal supply registers in seconds with Vent Caps, and the return grille with the Duct Ninja. No ladder, no tape.
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