SettingsSettings for this calculationUS
The interior width of the air shower chamber.
Measure the clear interior width between the nozzle walls, not the exterior enclosure dimension.
The vertical height over which nozzles are arranged to cover a person from head to foot.
This is the nozzle coverage zone height, typically matched to an average adult's height range, not necessarily the full interior chamber height.
The horizontal center-to-center spacing between nozzles in a row, per the air shower manufacturer's layout.
Closer spacing gives more overlapping coverage but requires more nozzles and airflow capacity — confirm the manufacturer's recommended spacing for the target cleanroom classification.
The vertical center-to-center spacing between nozzle rows, per the air shower manufacturer's layout.
From the manufacturer's layout, not chosen. The spacing is set by each nozzle's throw and spread so that adjacent curtains OVERLAP across the whole height of a person — open the rows up and you leave horizontal bands that are never swept, which is the single thing the equipment exists to prevent. It is also why a taller cabinet needs more rows rather than faster air.
Total nozzles needed
48 nozzles
Nozzle spacing, coverage angle, and airflow velocity requirements are manufacturer-specific for the target cleanroom classification — confirm the exact layout from the air shower manufacturer's engineering data.
- Nozzles per wall
- 24 nozzles
- Gap left at the end of a nozzle row
- 0.56 ft
- Gap left above the top nozzle row
- 0.33 ft
They open the calculator with your figures already in it
Cleanroom Air Shower Nozzle Count Calculator: 48 nozzles — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Nozzles per wall = ceil(Chamber Width ÷ Horizontal Nozzle Spacing) × ceil(Chamber Height ÷ Vertical Row Spacing); total nozzles = nozzles per wall × 2 (opposing walls) — a standard layout method for air shower nozzle arrays, which target a person from multiple angles/heights to dislodge particulates before cleanroom entry.
Inputs used
- Air Shower Chamber Width
- 3.5 ft
- Air Shower Chamber Height (Nozzle Coverage Zone)
- 7 ft
- Horizontal Nozzle Spacing (per Manufacturer)
- 11.75 in
- Vertical Row Spacing (per Manufacturer)
- 16 in
Intermediate steps
- Nozzles per wall
- 24 nozzles
- Gap left at the end of a nozzle row
- 0.56 ft
- Gap left above the top nozzle row
- 0.33 ft
Confidence note: Nozzle spacing, coverage angle, and airflow velocity requirements are manufacturer-specific for the target cleanroom classification — confirm the exact layout from the air shower manufacturer's engineering data.
What this calculation does not cover
- Every nozzle added has to be fed. Jet velocity at the nozzle face is what strips particles off a garment, and that velocity is total blower airflow divided across the nozzles, delivered through a HEPA filter that is already the largest resistance in the loop. Double the count without checking the blower curve and each jet gets half the air — a chamber that looks well covered and blows nothing hard enough to release anything.
- The air has to get back. An air shower recirculates, so whatever the nozzles deliver must return through a low-level grille to the blower and filter. A chamber short of return free area simply pressurizes: the jets stall against their own back pressure and measured face velocity falls well below the nozzle rating no matter how many nozzles are on the walls.
- Coverage is not removal. What actually comes off a garment is a product of jet velocity, the angle each nozzle is aimed at, and how long the cycle runs — typically 10 to 30 seconds behind a door interlock. Shoe tops, cuffs and shins are the zones that keep failing particle counts, and they fail on aim and dwell time rather than on a wall being short of nozzles.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- Nozzles per wall = ceil(Chamber Width ÷ Horizontal Nozzle Spacing) × ceil(Chamber Height ÷ Vertical Row Spacing); total nozzles = nozzles per wall × 2 (opposing walls) — a standard layout method for air shower nozzle arrays, which target a person from multiple angles/heights to dislodge particulates before cleanroom entry.
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