Air Changes Per Hour

Air Changes Per Hour

Determining the number of Air Changes Per Hour or (ACH) is crucial when choosing an air purification system. Which model and how many units you will need for your air purification needs? The following data has been gathered from various sources. We continually look to ASHRAE , NAFA, the EPA, and Engineering websites for newly updated clean air information. The lists below shows engineering recommendations for the number of air changes needed  in specific buildings and rooms. Your needs may vary. We also include a table on required air changes per occupant. Using these charts you should be able to determine how much air purification you need. 

Air changes can be done by bringing in fresh outdoor air or by indoor air purification.  The combination of both air purification and makeup air is often a great answer. Remember these are only recommendations.  If you need more help planning the Indoor Air Quality for your business or home, please give the experts at LakeAir a call @ 800-558-9436.

The data presented below are suggestions only. You should consult your local Government, OSHA or EPA for for any official requirements.

Building / Room Recommended Air Changes Per Hour
All spaces in general 5 min
Arcades 12-16
Assembly halls 6-8
Attic spaces for cooling 12 – 15
Auditoriums 8 – 15
Bakeries 20 – 30
Banks 5 – 10
Bank Vaults 6
Barber Shops 10 – 14
Bars 20 – 30
Beauty Shops 18 24
Bedrooms 4 – 8
Boiler Rooms 15 – 20
Bowling Alleys 14 – 20
Cafeterias 12 – 15
Casino (non smoking) 14 – 18
Casino  (Smoking) 20 – 30
Classrooms (ART) 16-20
Classrooms (ages 5 and up) 12 – 16
Classrooms (science lab) 16 -20
Classrooms (shop classes) 16 -20
Churches 8 – 15
Cigar Lounges 20 – 30
Club rooms 12
Clubhouses 20 – 30
Coin-operated dry cleaner 24 -20
Coin-operated laundries 11-13
Cocktail Lounges 20 – 30
Computer Rooms 8 -12
Commercial dry cleaner 24 -30
Commercial Laundry 22-26
Conference Roomos 5 – 8
Court Houses 4 – 10
Day Care (ages up to 4) 14- 18
Dance halls 16-20
Dental Centers 8 – 12
Department Stores 6 – 10
Dining Halls 12 -15
Dining rooms (restaurants) 12
Dress Shops 6 – 10
Drug Shops 6 – 10
Dry Cleaners 6 – 20
Engine rooms 4 – 6
Factory buildings, ordinary 2 – 4
Factory buildings, with fumes or moisture 10 – 15
Fast Food 12 – 14
Fire Stations 4 – 10
Food Processing 10 – 25
Foundries 15 – 20
Galvanizing plants 20 – 30
Garages repair 20 – 30
Garages storage 4 – 6
Health Club 20 – 26
Homes, night cooling 10 – 18
Hookah 20 – 30
Hospital rooms 6 – 10
Kitchens (commercial) 15 -30
Kitchens ( residential ) 8 -14
Laundries 10 – 15
Libraries, public 5
Lunch Rooms 12 -15
Luncheonettes 12 -15
Nightclubs 20 – 30
Machine shops 6 – 12
Malls 6 – 10
Meat Processing 20-26
Medical Centers 8 – 12
Medical Clinics 8 – 12
Medical Offices 8 – 12
Mills, paper 15 – 20
Mills, textile general buildings 5
Mills, textile dye houses 15 – 20
Money Counting room 8 – 15
Municipal Buildings 5 – 10
Museums (Childrens) 12 -15
Museums / Galleries 10-14
Nail Salons 18 -24
Offices, public 5
Offices, private 5
Photo dark rooms 10 – 15
Pharmacy Prep 8 – 10
Pig houses 6 – 10
Pet Shops 12 – 14
Photo Studios 6 – 8
Police Stations 5 – 10
Post Offices 5 – 10
Poultry houses 6 – 10
Precision Manufacturing 10 – 50
Public Retail Stores 6 – 10
Pump rooms 5
Residences 4 – 6
Restaurants 8 – 12
Retail 6 – 10
School Classrooms 4 – 12
Shoe Shops 6 – 10
Shopping Centers 6 – 10
Shops, machine 5
Shops, paint 15 – 20
Shops, woodworking 5
Smoking Lounges 20-30
Substation, electric 5 – 10
Supermarkets 8 – 10
Swimming pools 20 – 30
Town Halls 5 – 10
Taverns (non smoking) 14-18
Taverns (Smoking) 20 – 30
Theaters 8 – 15
Transformer rooms 10 – 20
Turbine rooms, electric 5 – 10
Vape Shop 20 – 30
Warehouses 6 – 30
Waiting rooms, public 5
Welding Areas 12-16
Type of Building and Room Occupant CFM
Animals Sheep CFM per Animal 6
Horses CFM per Animal 85
Hens CFM per Animal 6
Cows CFM per Animal 212
Chickens CFM per Animal 4
Pigs, sow CFM per Animal 127
Piglet CFM per Animal 32
Apartments CFM per Person 32
Assembly halls CFM per Person 21-32
Auditoriums CFM per Person 21-32
Bakeries Production CFM per Person 32-42
Pastry room CFM per Person 32-42
Banks Service CFM per Person 21-32
Archive CFM per Person 15-21
Staff CFM per Person 21-32
Baths CFM per Person 32
Barber Shops CFM per Person 21-32
Bars CFM per Person 32-42
Beauty Shops CFM per Person 21-32
Bedrooms 4 – 8
Cafeterias CFM per Person 21-32
Cinemas/Theaters CFM per Person 15-21
Chemist’s shops Sterile room CFM per Person 42-53
Laboratory CFM per Person 42-53
Packing room CFM per Person 21-32
Store CFM per Person 15-21
Churches CFM per Person 21
Clubhouses CFM per Person 32-42
Cocktail Lounges CFM per Person 32-42
Computer Rooms CFM per Person 21-32
Court Houses CFM per Person 21-32
Dance halls CFM per Person 32-42
Dental Clinics, Offices CFM per Person 21-32
Department Stores (cfm/Sq.Ft) CFM per Person 21-32
Dining Halls CFM per Person 21-32
Drug Store CFM per Person 21-32
Engine rooms CFM per Person 21-32
Exhibition halls CFM per Person 21-32
Fire Stations CFM per Person 21-32
Garages CFM per Person 21-32
Hospitals General CFM per Person 32
Therapy CFM per Person 21-32
Operating theater CFM per Person 42-64
Autopsy CFM per Person 32
Hotels Reception CFM per Person 32-42
Room CFM per Person 21-32
Industries Factory CFM per Person 21-42
Carpenter work shop CFM per Person 21-32
Car repair shop CFM per Person 21-32
Car repair shop, exhaust outlet CFM per Car 127-170
Mechanical work shop CFM per Person 32-42
Welding CFM per Person 42
Assembly CFM per Person 21-32
Jails CFM per Person 21-32
Jewelry Shop CFM per Person 21-32
Libraries CFM per Person 21-32
Lunch Rooms, Luncheonettes CFM per Person 21-32
Municipal Buildings CFM per Person 21-32
Museums CFM per Person 21-32
Laundries CFM per Person 32-42
Lavatories CFM per Person 21
Night Clubs CFM per Person 32-52
Malls CFM per Person 21-32
Motels CFM per Person 32-42
Offices Module CFM per Person 21-42
Landscape CFM per Person 21-42
Conference room CFM per Person 62-64
Lecture room CFM per Person 21-42
Dining hall CFM per Person 32-53
Staff, changing clothes CFM per Person 21-32
Dining room CFM per Person 32
Resting room CFM per Person 32
Police Stations CFM per Person 21-32
Post Offices CFM per Person 21-32
Precision Manufacturing CFM per Person 21-32
Restaurants CFM per Person 21-32
Retail Stores (cfm/Sq.Ft) CFM per Person 21-32
Schools Classroom CFM per Person 21-32
Shops CFM per Person 21-32
Shopping Centers CFM per Person 21-32
Sports halls CFM per Person 32-42
Supermarkets CFM per Person 21
Swimming pools CFM per Person 32
Taverns CFM per Person 21-32
Town Halls CFM per Person 21-32