HVAC Filtration Guides

Technical articles on EN filter standards, grades, replacement intervals, and application selection for South African industry.

2026/04/22

Air Filter Grades Explained: G4, F9, H14 and What EN779 Actually Means

A plain-language guide to HVAC air filter grades — G4, F5, F7, F9, H13, H14 — and the EN779 and EN1822 standards that define them. Written for South African HVAC engineers and facilities managers.

2026/04/22

Baghouse Filter Guide: Cartridge Filters for Pulse-Jet Dust Collectors in South Africa

A practical guide to baghouse cartridge filters — how pulse-jet baghouse systems work, when to replace cartridge filters, cross-referencing by dimension, and supplier considerations for South African industrial facilities.

2026/04/22

EN779 vs ISO 16890: What South African HVAC Engineers Need to Know

EN779:2012 and ISO 16890 classify HVAC air filters differently. This article explains the key differences, why EN779 remains the standard in South African practice, and how to interpret ISO 16890 filter classifications when they appear in project specs.

2026/04/22

HEPA Filter Grades Explained: H13 vs H14 — Which Do You Need?

H13 and H14 are both classified as HEPA, but they have different performance levels and are tested to EN1822 with different efficiency thresholds. This guide explains the difference and when each grade is required in South African pharmaceutical, healthcare, and cleanroom applications.

2026/04/22

HVAC Filter Replacement Intervals: How Often Should You Change Air Filters in South Africa?

Practical guidance on HVAC air filter replacement intervals for South African conditions — G4 panel filters, F9 pocket filters, and H14 HEPA. Covers Highveld dust loads, differential pressure monitoring, and maintenance scheduling.