1. Kitchen Ventilation

2. Systems

3. Multi Point Ventilation

4. Heat Recovery Ventilator

5. Bath Ventilation

6. Bathroom Exhaust Fans

7. Bathroom Exhaust Fans CODE for Baths without bathing or spas:
3 SF Glazing ½ Operable or
Baths 75SF or less - 50 CFM Fan or
Over 75 SF – Intermittent Ventilation System 1 air change every 12 minutes
Continuous Ventilation System at 20 CFM

8. Bathroom Exhaust Fans Baths with bathing and spas 50 CFM Intermittentor
20 CFM Continuous

9. Multi Point Ventilation

10. Kitchen Ventilation Considerations
Fan Type
Propeller Fan – Limited air capacity and noisy
Axial Fan – Better air movement but still noisy
Centrifugal Blower (Squirrel Cage) The best

11. Axial Fan

12. Centrifugal Blower

13. Sound Levels Sound is measured in Sones
1-Sone equals the loudness of a pure tone having a frequency of 1,000 hertz at 40 decibels.

14. Decibels 0 The softest sound a person can hear with normal hearing
10 normal breathing
20 whispering at 5 feet
30 soft whisper
50 rainfall
60 normal conversation
110 shouting in ear
120 thunder

15. Sones
The Home Ventilation Institute sets a limit of 9.0 sones for kitchen fans up to 500 CFM
Reference – A fan with a sone rating of 8.0 sones is twice as loud as one rated at 4.0 sones.
Reference - Refrigerators run at about 1.0 sone.

17. Broan Silent Series 110 cfm .7 Sones

18. In-Line Ventilator Fan 110 CFM 1.0 Sones 210 CFM 2.0 Sones

19. Kitchen Ventilation

20. Kitchen Exhaust Fans
CODE
100 CFM Intermittent Or
25 CFM Continuous

21. Multi Point Ventilation

22. Vented Hood System

23. Recirculating Fan in Microwave Combo

24. Kitchen Ventilation
Heat
Grease
Steam
Odor
Smoke

25. Recirculating Range Hood

26. Recirculating Ventilation System
This type of system will only remove two
Heat
Steam

27. Downdraft

28. Down Draft Ventilation

29. Down Draft Ventilation

30. Range Hood Installation

40. Integral Fan Vented Through Roof

41. In Line Fan

42. Integral Through Soffit

43. Remote Ventilator

44. Through Crawlspace

45. Down Draft Through Floor

46. Down Draft Through Roof

47. Kitchen Ventilation Considerations
Fan – 250 CFM minimum
Ducts
Duct run lengths
Interior Fan (power)
Keep duct runs as short and straight as possible.
6” round or 3 ¼” x 10 rectangular ducts
Maximum run = 25’ maximum

48. Kitchen Ventilation Considerations
Exterior or In-Line Fan (power)
9” round or 3 ¼” x 14” rectangular duct
Maximum run = 55’ maximum