Maintenance
The HEPA Filter Isn’t Leaking — Your Housing Is
Separate filter-media defects from gasket and housing leaks by checking the leak location, sealing interface and test conditions together.
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Filter Technology
Clear answers to the questions behind a good filter choice. Selection, standards, energy and the details that matter in use.
HEPA & ULPA · Featured article
H13 or H14? A HEPA Filter Decision Guide by Application
Choose between H13 and H14 by checking the application, required evidence and pressure drop, without confusing filter class with room classification.
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32 articles
HEPA & ULPA
H13 or H14? A HEPA Filter Decision Guide by Application
Choose between H13 and H14 by checking the application, required evidence and pressure drop, without confusing filter class with room classification.
Read the articleHEPA & ULPA
Replacing a HEPA Filter in an Existing Housing: The 6 Dimensions and 3 Gasket Checks to Confirm Before You Order
Confirm the frame dimensions, gasket geometry and operating duty before ordering a replacement for an existing HEPA housing or terminal box.
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The Air We Breathe
A foundation article on gases, aerosols and the air we breathe.
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Effect Of Measuring Method
Why particle count and particle mass tell different stories.
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Chemical Filtration
How particle filtration and gas-phase filtration work together.
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EN ISO 14644-1
A reference to airborne particle classification in cleanrooms.
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Comparison of Filter Standards: ISO 16890, EN 779 and MERV
Compare ISO 16890, historical EN 779 classes and the separate MERV system.
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Particle Matter
What airborne particles mean for filter choice, indoor air and HVAC equipment.
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Basic Principles of Mechanical Filtration
How straining, impaction, interception, diffusion and electrostatic attraction capture particles.
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ISO 16890 Standard for Air Filters Used in General Ventilation
An earlier introduction to ISO 16890 classification and filter testing.
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Selection of Filters According to ISO 16890 Standard in HVAC Applications
How outdoor air and supply-air requirements shape a filtration system.
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