Calibration of Minneapolis Blower Door™ Systems


Looking to Calibrate your Gauge?  Download the Equipment Service Form (or fill-out in your browser)

Frequency of calibration

DG-1000’s, DG-700’s and DG-500’s should be recalibrated every two years to maintain the instruments accuracy specifications of 1% of reading, or 0.15 Pa, whichever is greater.

Details of returning your gauge for calibration or repair

  • Calibration is performed at our facility in Minneapolis, MN in USA. We do not calibrate gauges at conferences or trade shows.
  • Please complete the Equipment Service Form(fill-out by hand or fill-out in your browser) Please include the Equipment service form with the equipment being sent.
  • Cost for calibration of a TEC digital pressure gauge (DG-2, DG-3, DG-500, DG-700, DG-1000) is excluding shipping / logistics costs and VAT.
  • Turn around time at our facility in Minneapolis, USA for calibration is typically 2-3 days following receipt of the instrument (assuming no repairs are necessary). We will provide a NIST traceable calibration certificate which includes “as found” as well as “current condition” pressure data.


Checking Gauges in the Field – Field check

In lieu of sending your DG-1000, DG-700 or DG-500 gauge into TEC once every two years for calibration, customers may choose to perform a field calibration check procedure which is contained in the Digital Gauge Field Check document. This document describes a procedure to field check the calibration of digital gauges against a recently calibrated digital gauge that is being used as an in-house reference standard.

We have also created a simple Excel-based tool which supports the Field Check Process and Summary of Results.


We recommend that a field calibration check be performed annually, or whenever a gauge has been dropped or damage is suspected. Results of field calibration checks should be recorded and documented by the customer using the sample log sheets provided at the end of the calibration check document. Gauges that fail the Digital Gauge Field Calibration Check will need to be sent to TEC for recalibration.

Comparing channels on the same gauge

It is also a good idea to periodically check the two channels of the DG-1000, DG-700 and DG-500 pressure gauge against each other to be sure they are reading very close to same value (e.g. they should always be within 1% of each other). This test will quickly isolate gauges with large problems (e.g. damaged flow sensors), and is described in the

Comparing Channels on the Same Gauge document. This procedure does not replace the need for gauge recalibration once every two years.

Calibration of Blower Door and Duct Blaster® Fans

TEC Blower Door and Duct Blaster® fans maintain their calibration unless physical damage occurs to the fan or flow sensing system. Conditions which can degrade calibration of the fan are easily detected and should be field tested by the customer on a regular basis using the procedures contained in the Fan Field Check document  (see Fan Field Check document). This document describes a procedure to check for damaged flow sensors, leaks in the flow sensor or tubing running from the flow sensor to the fan pressure tap, or improper positioning of the flow sensor relative to the fan housing. We recommend that a field check of the fan be performed at least annually, or whenever a fan has been dropped or damage is suspected. Results of field checks should be recorded and documented and sample log sheets are provided at the end of the field check document for this purpose.

Blower Door and Duct Blaster fans can be custom calibrated at the TEC facility for a fee. Custom fan calibration parameters can be easily entered into our TECTITE™  and TECBLAST™  software. Note: Custom fan calibration is not necessary for most testing applications.

Field Calibration Plate for Duct Blaster System with DG-1000 or DG-700 Gauge

The Field Calibration Plate allows you to quickly check the calibration of the entire Duct Blaster System with DG-1000 or DG-700 gauge. The calibration plate, which contains a 5 inch diameter hole, is simply mounted on the square transition piece that is connected to the end of the flex duct. The Duct Blaster fan is turned on to pull air through the calibration plate and simulate a duct leakage test. Results from the simulated test are compared to the known leakage rate to determine if the entire system is within a +/- 3% accuracy range. This calibration check covers the entire system, including the Duct Blaster fan, the DG-1000 or DG-700 gauge, and the flex duct.

A Duct Blaster Field Calibration Plate can be purchased from us. Instructions for using the Calibration Plate are contained in the Duct Blaster Field Calibration Plate document.

Returning Equipment

Click here for instructions on how to properly return equipment to us.


Salimus Building Envelop Testing
Unit 111, Concorde Tower, Cluster H,JLT

Dubai, UAE. P.O. Box 45022

T: +971 4 447 1776



Attn: Equipment Repair/Calibration

When sending equipment for calibration or repairs, please use the Equipment Service Form, fill it out completely, and include a copy of the completed form along with the equipment being returned.


Equipment Repairs

If you ever have an equipment problem, we always stock a complete line of replacement parts, and can respond quickly to any service problem. All equipment needing repairs (or calibration) should be sent to our facility.


Completing Field Repairs

After several years of use, sometimes the Blower Door Frame Cam Levers Need Replacement.  Download the CAM LEVER REPLACEMENT PROCEDURE here.