Brewing engineers require air filtration that maintains flavour stability across 45 m³/h to 2,800 m³/h airflow ranges, withstands repeated CIP cycles at 85 °C, and retains integrity down to 0.1 micron particulate. These parameters define the operational envelope for HVAC intake, fermentation room recirculation, and packaging line make-up air. The Air & HVAC Filtration range delivers consistent performance where microbial ingress, volatile organic compound carryover, or fibre shedding would compromise sensory profiles or trigger non-conformance under 3-A, EHEDG, and CIP hygiene protocols.
Material Compatibility with Hygienic Process Air
Stainless steel frames and 316L hardware are standard across all pocket bag and HEPA/ULPA panels in this range. Unlike polymer-framed alternatives, these resist chloride-induced pitting during caustic CIP exposure and avoid outgassing of plasticisers into process air streams. The G2 metal Nylon Mesh Filter provides coarse pre-filtration without hydrolysis risk. PP melt blown filter fabric and PP spunbond non woven fabric are validated for use downstream of stainless housings but must be verified for extractables per your internal sensory testing protocol.
Filtration Efficiency vs. Pressure Drop Trade-off
A documented trade-off exists between efficiency class and long-term ΔP stability. Selecting an H14 W V Type HEPA Filter over an E11 Rigid pleated box HEPA filter increases initial pressure drop by 25–40 Pa at rated flow — a measurable downside when paired with variable-frequency drive-controlled AHUs. In practice, we typically specify M5 to F8 Glass Fiber Pockets Filter upstream of high-efficiency stages to extend service life and reduce fan energy consumption. This staging strategy sacrifices minimal capture efficiency at >10 µm while avoiding premature clogging of final-stage filters.
Cleanroom Equipment Integration
The SCD Pass Box, SFL Air Shower, and SGZW Level Clean Bench integrate directly with HVAC ductwork using standard flange interfaces compatible with ASME BPE tubing specifications. Fan Filter Unit (FFU) modules support ceiling-mounted laminar flow zones above bottling conveyors or yeast propagation stations. All units accept GW, GY, GD, or GGY High Efficiency air filters — permitting airflow adaptation from 300 to 1,200 m³/h per unit without frame modification. Photocatalytic filter paper is available as an optional layer but requires UV-A irradiation to activate; it does not apply where ambient lighting lacks spectral output in the 365–400 nm band.
Selection Limits for Non-Standard Conditions
This selection is unsuitable for environments exceeding 250 °C continuous duty or where airborne oil aerosols exceed 0.01 mg/m³. It should not be deployed in ammonia refrigeration return air without prior validation of sealant compatibility. The CD Multi Pocket bag filter and photocatalytic filter paper both have defined limits for relative humidity above 95% RH at dew points below 0 °C. Avoid installation upstream of steam-jacketed duct sections unless using the GGY High Air Filter for high temperature with separators, which is rated for intermittent exposure up to 280 °C.
| Filter Type | Max Temp (°C) | Media Chemistry | Seal Type | CIP Compatible |
|---|---|---|---|---|
| H13 to U16 Sharp Edge Mini-Pleated HEPA ULPA Filter | 80 | Glass fibre | Edge-bonded | Yes |
| GD High Efficiency filter for high temperature and high air flow | 250 | Specialty glass | Gasketed | Limited |
| GY High Efficiency air filter with separator | 120 | Synthetic | Gasketed | Yes |
Refer to the table for thermal and chemical boundaries.
- Verify seal geometry against your duct flange tolerance before specifying Gel Sealant Mini-Pleated variants.
- Request material safety data sheets for PP spunbond non woven fabric if used in direct contact with ethanol-saturated air.
- Confirm gasket compression set data for SFL Air Shower installations requiring >10,000 door cycles/year.
For liquid-side particulate control in wort clarification or cold-side carbonation, refer to our Liquid Filtration systems — which share the same 316L construction ethos but address different failure modes. Dust & Flue-Gas Filtration solutions are engineered for particulate loading orders of magnitude higher than brewing HVAC applications and should not be substituted here. The priority remains flavour-stable, hygienic flow — not just particle count reduction, but predictable, verifiable, repeatable air quality across seasonal humidity swings and production ramp-ups.
Common questions on air & hvac filtration
When should a pocket bag filter be replaced by a HEPA panel?
They do different jobs. Pocket bags at M5 to F9 carry the bulk of the dust load and protect the final stage, while an H13 to U16 panel only performs if the stages ahead of it are doing their work. Moving the bag stage out of the train shortens panel life rather than extending it.
What separates sharp edge from gel sealant mini-pleated panels?
Both are offered from H13 to U16. The sharp edge version uses an extruded anodised aluminium frame with hot-melt glue separators and a polyurethane sealant; the gel sealant version seals the media pack differently into the frame, which changes how the panel seats in the housing and how it is changed out.
How do I know when a final filter is finished?
The panel is retired at 300 Pa and a pocket bag at 450 Pa, both read on the differential pressure gauge that serves the rest of the train. Continuous service is limited to 90 ºC on both formats, so a reading above that points at the duty rather than at the filter.