BlowerDoor GmbH

What BlowerDoor GmbH does

BlowerDoor GmbH is a privately held German limited company (GmbH, HRB 101115) founded in 1989 in Springe-Eldagsen near Hannover, where it is headquartered at the Energie- und Umweltzentrum am Deister. The firm holds exclusive General Distributor rights for Minneapolis BlowerDoor measurement systems across more than 30 European countries and operates with fewer than 10 employees under managing directors Paul Simons and Alexander Kiß.

The company's core offering is a modular line of air tightness measurement systems built on the fan-pressurization (blower door) principle, including the BlowerDoor Standard (19-7,200 m³/h range), the compact BlowerDoor MiniFan for passive houses and cleanrooms, and the BlowerDoor MultipleFan configuration for buildings up to 440,000 m³. These systems are controlled by the DG-1000 touchscreen digital pressure gauge with integrated WiFi/Bluetooth and run TECTITE Express 5.1, TECLOG, TEC Gauge, and TEC Auto Test software. Adjacent accessory products — the SPRAY BAR for rain tightness, Minneapolis Micro Leakage Meter (MLM) for duct leakage, a-Wert MessSystem for component permeability, FireProtection for gas suppression retention times, and thermography integration — extend the platform into fire protection, cleanroom validation, and facade testing. Hardware is backward-compatible across generations.

Revenue is generated through four streams: one-time sale of measurement hardware and accessories (direct, via blowerdoor-unlimited.de, and through regional trading partners), recurring factory and DAkkS/Cofrac-accredited calibration services with mandatory functional inspection (€440-€890 per blower), fee-based classroom training and free webinars (€349-€489 per seminar), and consumables/accessories. Customer segments are horizontal and primarily include certified building air tightness testers, fire protection professionals, cleanroom operators, chimney sweeps (Schornsteinfeger), and architects/engineers/energy consultants, with no enterprise concentration evidenced and distribution reach spanning more than 30 European countries.

Name

BlowerDoor GmbH

Legal name

BlowerDoor GmbH

Website

https://blowerdoor.de

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

1–10 employees

Short description

BlowerDoor GmbH is a German specialist distributor of Minneapolis BlowerDoor air tightness measurement systems, serving certified building testers, fire protection professionals, cleanroom operators, and chimney sweeps across more than 30 European countries with hardware, DAkkS-accredited calibration, and training.

Ownership category

akta.pro rank

Product category

Building Air Tightness Measurement Equipment

NAICS

Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing (333413)

SIC

Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564)

akta.pro primary industry

Fans, Blowers & Ventilation Units (Supply/Exhaust/Inline) (IMADANAB)

Keywords

• Building air tightness measurement
• Blower door testing
• Building envelope diagnostics
• Air leakage testing equipment
• Fan pressurization measurement

Headquarters

HQ city

Springe

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Sale of Measurement Hardware: Direct sale of BlowerDoor measurement systems (Standard, MiniFan, MultipleFan), pressure gauges (DG-1000), and accessories through direct sales and the BlowerDoor-unlimited.de online shop.
2. Calibration Services: Factory calibration (1-point) and DAkkS/Cofrac accredited calibration for BlowerDoor blowers and pressure gauges. Includes mandatory functional inspection. Calibrated devices include DG-700, DG-1000, APT, BlowerDoor Standard, and MiniFan.
3. Training and Seminars: Fee-based classroom seminars (e.g., Basiskurs BlowerDoor, MultipleFan seminar, certified FLiB training) and free webinars on air tightness topics. Seminar fees range from €349–€489 plus VAT.
4. Consumables and Accessories: Sale of accessories, spare parts, foggers (MiniFogger, HandFogger, HeavyFogger, PowerFogger), sealing materials, transport cases, and other consumables through the online shop blowerdoor-unlimited.de.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels8 records

Core offering

BlowerDoor GmbH distributes Minneapolis BlowerDoor air tightness measurement systems across Europe, supplying modular hardware (BlowerDoor Standard, MiniFan, MultipleFan), the DG-1000 digital pressure gauge, and specialized software (TECTITE Express 5.1, TECLOG, mobile apps) for testing building envelope air leakage per DIN EN ISO 9972 and DIN EN 13829. The offering is rounded out by accessory rigs (SPRAY BAR, MLM, a-Wert MessSystem), DAkkS/Cofrac-accredited calibration services, and FLiB-recognized classroom seminars and webinars.

Product overview

BlowerDoor GmbH offers a modular portfolio of air tightness measurement systems for buildings, centered on the Minneapolis BlowerDoor brand. The core products include BlowerDoor Standard (for general use, 19-7,200 m³/h), BlowerDoor MiniFan (compact system for passive houses and apartments), and BlowerDoor MultipleFan (for large buildings up to 440,000 m³). These systems are controlled via the DG-1000 digital pressure gauge with touch screen and wireless connectivity, running TECTITE Express 5.1 software and mobile apps. Accessory products extend capabilities: SPRAY BAR for rain tightness testing, Minneapolis Micro Leakage Meter (MLM) for duct testing, a-Wert MessSystem for component permeability, FireProtection for gas suppression retention times, and thermography integration. Supporting services include DAkkS-accredited calibration, professional training seminars (certified by FLiB e.V.), and free webinars. The company operates as General Distributor for Minneapolis BlowerDoor technology in Europe.

Differentiator

Problem solved

Functional benefit

Brands

• BlowerDoor-unlimited.de: Online shop for purchasing BlowerDoor products, consumables, accessories, and registering equipment for calibration.
• BlowerDoor Unlimited
• BlowerDoor Academy
• KompetenzCenter

Products and services

• BlowerDoor Standard Modular air tightness measurement system with a range of 19–7,200 m³/h used for blower door tests on all building types and sizes per DIN EN ISO 9972 / DIN EN 13829. Can be combined with MultipleFan for large buildings; designed for new construction and renovation, marketed through direct sales and blowerdoor-unlimited.de.
• BlowerDoor MiniFan Compact Minneapolis BlowerDoor system for testing air tightness in passive houses, individual apartments, and cleanrooms. Designed for smaller measurement ranges than the Standard system and combines with accessories like the Micro Leakage Meter for cleanroom and HVAC applications.
• BlowerDoor MultipleFan Multi-fan configuration of the Minneapolis BlowerDoor system for air tightness measurement in large and tall multi-family residences as well as industrial and administrative buildings up to 440,000 m³. Used together with TECLOG measurement software.
• DG-1000 Digital Pressure Gauge Digital pressure measuring device with high-resolution touchscreen, intelligent microprocessor, integrated WiFi and Bluetooth, free firmware updates, and compatibility with all BlowerDoor measurement systems. Acts as the central control and readout unit for the entire BlowerDoor product line and connects to TECTITE Express software plus the TEC Gauge and TEC Auto Test mobile apps.
• DG-700 Digital Pressure Gauge Legacy digital pressure measuring device (predecessor to DG-1000). Eligible for BlowerDoor factory and DAkkS calibration services with a manufacturer-recommended 2-year calibration interval.
• SPRAY BAR Mobile stainless steel spray system for testing rain tightness on curtain facades (mullion-transom constructions) and on the installation of windows, French doors, and exterior doors per EN 13051. Generates a uniform water film to simulate driving rain on building envelopes in combination with BlowerDoor systems.
• Minneapolis Micro Leakage Meter (MLM) Functional testing instrument for ventilation systems and duct networks per DIN EN 12599, used in combination with the Minneapolis BlowerDoor line for measuring low air flow rates in cleanrooms and specialized applications.
• a-Wert MessSystem System for determining joint air permeability of building components (window and door seals) when used in combination with the Minneapolis BlowerDoor Standard measurement system.
• FireProtection (Door Fan Test) Software and methodology package for determining fire suppressant gas retention times (Door Fan Test) per ISO 14520, EN 15004, and VdS 2380/2381. Used with BlowerDoor Standard hardware to optimize the dimensioning of gas fire suppression systems and to prove achievable efficiency in server rooms, machinery rooms, and storage facilities.
• BlowerDoor Thermography Image-based thermography service offering combined with BlowerDoor differential pressure measurement for non-destructive detection and documentation of air leakages, especially in very large or tall buildings where localized leak identification adds significant value over quantitative n50/q50 testing alone.
• TECTITE Express 5.1 Software PC-based measurement software included with Minneapolis BlowerDoor systems. Supports automatic, semi-automatic, and manual measurements per DIN EN ISO 9972 and DIN EN 13829, includes a cruise control function (single-point measurement), generates test reports, and records calibration dates.
• TECLOG Software Measurement software package used for BlowerDoor MultipleFan deployments, designed to orchestrate multiple blower door fans for air tightness measurement of large and tall buildings.
• TEC Gauge and TEC Auto Test Mobile Apps Mobile applications for iOS and Android that connect to the DG-1000 via Bluetooth for field measurements without a laptop. TEC Gauge supports single-point measurement at a constant building pressure differential for quick quality assurance leak detection; TEC Auto Test performs a multi-point test per ISO 9972.
• BlowerDoor Calibration Services Factory (Werkskalibrierung 1-point) and DAkkS-/Cofrac-accredited calibration for Minneapolis BlowerDoor pressure measuring devices (DG-700, DG-1000, APT) and blowers (BlowerDoor Standard, MiniFan), with manufacturer-recommended 2-year intervals for pressure devices and 4-year intervals for blowers. Includes mandatory functional inspection; replacement blowers available during calibration.
• BlowerDoor Academy — Training & Seminars Classroom and online training program (BlowerDoor Academy) covering Basic BlowerDoor course (ISO 9972 / DIN EN 13829), MultipleFan measurement, FLiB-recognized training, fire protection (Brandschutzmessung), cleanroom tightness per VDI 2083/19, radon testing, and specialist Differenzdruckmesstechnik certification prep. Includes fee-based classroom seminars (€349–€489 plus VAT) and free webinars; half the course fee is credited toward purchase of a BlowerDoor system within 6 weeks of completion.

Quantifiable outcome

• Air tightness improvement from n50 = 7 h⁻¹ (pre-renovation) to n50 = 0.38 h⁻¹ (post-renovation) demonstrated in a multi-purpose hall case study
• +1 more outcomes

Named customers2 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature12 records

Partnerships

Seven partnerships are on record, tiered core, major and minor.

• Minneapolis BlowerDoor (US Manufacturer)coreOEM/ Whitelabel/ Licensing Partner · 1 January 1989BlowerDoor GmbH serves as the General Distributor for Minneapolis BlowerDoor measurement systems in Europe, importing, selling, and supporting the hardware and software product line across more than 30 European countries.
• FLiB e.V. (Fachverband Luftdichtheit im Bauwesen)coreStrategic or Co-development PartnerThe German Association for Building Air Tightness (FLiB) and BlowerDoor GmbH collaborate closely on certification standards, training programs, and industry guidelines. BlowerDoor training courses are FLiB-recognized and qualify participants for FLiB certification as Certified Building Air Tightness Testers.
• Energy and Environmental Center at Deister (Energie- und Umweltzentrum am Deister)coreImplementation/ SI/ Consulting PartnerBlowerDoor GmbH is headquartered at the Energy and Environmental Center at Deister in Springe-Eldagsen, sharing facilities for seminars, training, and industry collaboration with other sustainable building organizations.
• EP Instruments Messtechnik + Kalibrierung GmbHmajorStrategic or Co-development PartnerEP Instruments in Niederstetten operates the DAkkS-accredited calibration laboratory for BlowerDoor blowers. A dedicated calibration stand was developed specifically for BlowerDoor measurement blowers and relocated to a new laboratory building in 2016 with expanded DAkkS accreditation scope.
• BlowerDoor Trading Partners (Premium Partner Network)majorChannel Partner/ Reseller/ DistributorA network of regional trading partners across Germany and Europe who resell BlowerDoor products and provide local sales, service, and support. The Premium Partner program provides personalized marketing materials including datasheets, roll-ups, and presentation templates.
• e.u.[z.] Energie- und Umweltzentrum am Deister GmbHcoreImplementation/ SI/ Consulting PartnerBlowerDoor seminars are organized in collaboration with the Energy and Environmental Center at Deister GmbH, which provides the seminar venue and facilities at Springe. The center also facilitates the BlowerDoor Basic Course and other training programs.
• Landheim TellkampfschuleminorOthersBlowerDoor GmbH supports the Landheim Tellkampfschule, a youth retreat facility in Springe, through donations and sponsorship. CEO Paul Simons serves as chairman. The hall renovation project served as a prominent BlowerDoor case study.

Scale indicators6 records

Recent moves2 records

Expansion highlights5 records

Direct peers

• Retrotec: US- and Canada-based manufacturer of blower door / building air-tightness measurement systems. Directly competes with Minneapolis BlowerDoor (the brand BlowerDoor GmbH distributes) on the same fan-pressurization measurement method, serving the same energy-audit and building-certification tester base worldwide.

Regional players

• Air Leakage Testing Ltd: UK-based specialist in building air-tightness testing services, using blower door equipment to deliver compliance testing for UK Building Regulations (Part L, Part F). Comparable buyer of BlowerDoor-style equipment on the practitioner side; does not sell competing hardware but represents the downstream service model in a single European geography.
• BES Group: UK provider of building compliance and air-tightness testing services alongside broader inspection and certification. Comparable as a downstream consumer of blower door equipment and as a competing service model in one European geography.

Others

• The Energy Conservatory: US-based company responsible for designing and manufacturing the Minneapolis BlowerDoor measurement systems that BlowerDoor GmbH distributes in Europe. It is both the principal supplier and effectively the upstream peer in building air-tightness equipment technology.
• FLiB e.V. (Fachverband Luftdichtheit im Bauwesen): German industry association for building air-tightness that co-defines the standards, training curricula, and certification regime underpinning BlowerDoor GmbH's tester ecosystem. Not a competitor but a core standards partner whose strategy directly affects BlowerDoor's regulatory moat.

Emerging players

• Kestrel Instruments (Nielsen-Kellerman): Manufacturer of portable handheld airflow, environmental, and heat-stress meters used by HVAC technicians, energy auditors, and building professionals. Smaller and more focused on field-portable measurement than BlowerDoor, but increasingly part of the same auditor kit and could expand into building envelope testing applications.

Broad incumbents

• TSI Incorporated: US manufacturer of precision airflow, particle, and IAQ measurement instruments serving HVAC, cleanroom, and industrial markets. Broadly competes in differential pressure and airflow measurement; supplies tools used by some of the same building-tester and cleanroom professional segments BlowerDoor addresses.
• Dwyer Instruments, Inc. US manufacturer of pressure, flow, level, and temperature measurement devices for HVAC and industrial process markets. Adjacent to BlowerDoor's differential-pressure measurement use case via its pressure gauges and airflow instrumentation, though Dwyer operates across a much wider industrial customer base.
• Wöhler Messgeräte Kehrgeräte GmbH: German manufacturer of building inspection and HVAC measurement instruments (smoke pens, flue gas analyzers, indoor air quality devices). Overlaps with BlowerDoor at the building diagnostics and chimney sweep / Schornsteinfeger customers, but with a broader building-services product portfolio.
• Testo SE & Co. KGaA: Large German-headquartered manufacturer of portable measurement instruments (pressure, airflow, thermal) used across HVAC, building diagnostics, and industrial applications. Overlaps with BlowerDoor in the building measurement category but as part of a much broader portfolio spanning food safety, emissions, and industrial process measurement.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@blowerdoor-gmbh
• Facebookfacebook.com/blowerdoor.de
• Instagraminstagram.com/blowerdoorgmbh
• Xx.com/blowerdoor_gmbh
• LinkedInlinkedin.com/company/blowerdoor-gmbh

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about BlowerDoor GmbH