At Approved Air, we are committed to ensuring that every service we provide meets the highest standards of performance and regulatory compliance.
Healthcare & Ventilation Solutions
HTM 03‑01 Validation & Verification
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Validation: We fully validate new and refurbished installations, ensuring that your systems comply with the necessary Health Technical Memorandum (HTM) standards.
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Verification: Using our extensive industry knowledge, we perform independent verifications. Our detailed, industry‐leading reports confirm that your systems adhere to the required standards for optimal performance.
Airflow Commissioning & System Rebalancing
Our commissioning and rebalancing services are designed to restore ventilation systems to their original design specifications. By optimising airflow and system performance, we help improve both safety and efficiency in critical environments.
Ultra-Clean Ventilation (UCV) Servicing & Entrainment Testing
Our specialised UCV services include routine servicing, remedial works, and entrainment testing. These services ensure that ultra-clean canopy systems maintain strict performance requirements, significantly reducing infection risks in sensitive settings.
HEPA Filter Integrity (DOP / DPC Testing)
We perform filter integrity testing using both Dispersed Oil Particulate (DOP) and Discrete Particle Counting (DPC) methods. This critical service ensures that your filters operate at peak efficiency, protecting both patients and staff from potential contamination.
Environmental & Air Quality Testing
Particle Counting & Clean-Up Rate Testing
Using state-of-the-art equipment, we conduct particle counting across multiple points within a space. Our detailed reports provide clear insights into airborne particulate levels. Additionally, our clean-up rate tests—performed in accordance with BS EN ISO 14644—evaluate a space’s ability to eliminate airborne particles after a disturbance.
Active Air & Microbiological Sampling
Our active air sampling and settle plate tests ascertain the concentration of colony-forming units (CFUs) to monitor the sterility and cleanliness of the environment. These services are essential in both healthcare and controlled cleanroom environments.
Indoor Air Quality (IAQ) Testing
We assess a wide range of air quality parameters—including temperature, humidity, CO₂/CO levels, VOCs, and microbial content—to help ensure safe and healthy indoor environments.
Ductwork, AHU, and LEV Services
Pre-Planned Maintenance & AHU Cleaning
We provide comprehensive pre-planned maintenance services, including a thorough clean of Air Handling Units (AHUs). Each service is accompanied by detailed documentation and photographic evidence of the work carried out, ensuring transparency and quality.
Duct Sampling & Kitchen Extract Inspections
Our duct sampling services include collecting dust samples, which are analysed by independent, certified laboratories.
Local Exhaust Ventilation (LEV) Testing
Our certified engineers (P601/P604 qualified) perform LEV testing to assess extraction ventilation systems in a variety of settings, ensuring these critical systems comply with relevant standards and deliver effective performance.
Why Choose Approved Air?
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Expertise & Certification: Our team is composed of HTM‑qualified, P601/P604-certified professionals with decades of experience.
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Comprehensive Reporting: Every service includes detailed, client-friendly reports, supported by data analytics and photographic evidence.
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Regulatory Compliance: We ensure that all our services adhere strictly to HTM guidance, HSE, CIBSE, and BS EN ISO standards.
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Nationwide Support: Fully insured and accredited, we proudly serve NHS trusts, private facilities, and specialised environments across the country.
Get in touch to discuss your requirements
Whether you require a routine check-up, full commissioning and rebalancing, or specialised air quality testing, Approved Air is your trusted partner in maintaining optimal indoor environmental quality. For more detailed information or to book a service consultation, please contact us.
Got a project you’d like to discuss?
Get in touch today and one of our knowledgable team members will assist you with your requirements.






