# Presentation: 118327

## What You Can’t Smell Might Hurt You !!

- The DOE National Workshop on State Energy Codes
- Burlington, VT
- July 16-18, 2001

## Don  Stevens

- Stevens and Associates
- Keyport, WA
- dstevens@telebyte.com
- Vice Chair, Home Ventilating Institute
- Voting Member, IRC Mechanical and Plumbing Committee
- Voting Member, ASHRAE 62.2 Committee

## Ventilation Strategies

- Supply Ventilation
- Exhaust Ventilation
- “Balanced” Ventilation

## Supply Ventilation Options

- Integrated with Air Handler
- Inline Supply Fan
- Multiport Supply Fan
- Dehumidifying Supply Fan

## Integrated with Air Handler

- Use air handler to pull in outdoor air
- Advantages:
- distribution
- filtration
- Disadvantages:
- Fan energy
- Cold air on furnace heat exchanger
- Draft complaints

## Inline Supply Fan

- May be integrated with the furnace for distribution
- May have dedicated supply duct(s)
- Advantages:
- Quiet, low energy
- Disadvantages:
- Extra fan
- Must be accessible

## Multiport Supply Fan

- Delivers to several rooms
- Can blend and/or filter air for comfort
- Advantages:
- Quiet, filtration, tempering, multiple grilles
- Avoids air handler temperature shock issues
- Disadvantages:
- More ducting
- Must be accessible for service

## (ALDES BV150 photo)

## Dehumidifying Supply Fan

- Single unit provides dehumidification, filtration, and ventilation air
- Advantages:
- Multipurpose unit
- Dehumidifies and filters both indoor and outdoor supply air
- Disadvantages:
- First cost, ducting

## (DEC photo)

## Exhaust Ventilation Options

- “Double Duty” Bath Fan
- Remote Inline Exhaust Fan
- Multiport Exhaust Fan

## “Double Duty” Bath Fan

- Quiet bath fan that provides both spot ventilation and whole house IAQ ventilation
- 0.2-1.5 sone fan to increase operation and life
- Advantages:
- Quiet, long life, no additional fan
- Disadvantages:
- First cost

## (Panasonic fan)

## Remote Inline Exhaust Fan

- Inline fan in attic with one or two pickups
- Remote mounted so fan noise is not an issue
- Advantages:
- Quiet operation if flex duct is used
- Versatile installation; may replace two fans
- Disadvantages:
- First cost, may  be noisy if metal duct is used
- Must be accessible for service

## (Fantech Inline)

## Multiport Exhaust Fan

- Box fan in attic with 3-8 pickups
- Remote mounted so fan noise is not an issue
- Advantages:
- Quiet operation if flex duct is used
- Versatile installation; may replace 3-8 fans
- Disadvantages:
- First cost, may  be noisy if metal duct is used
- Must be accessible for service

## (ALDES MPV200 photo)

## “Balanced” Ventilation Options

- Heat Recovery Ventilator
- Energy Recovery Ventilator
- Balanced Supply and Exhaust Fans
- Integrated Heating/Cooling/Ventilation

## Heat Recovery Ventilator

- Primarily used in cold climates
- Typically 60-70% efficient at heat recovery
- Advantages:
- May reduce heating costs
- Reduces drafts
- Disadvantages:
- Highest first cost
- “Cost effectiveness” is hard to calculate

## Energy Recovery Ventilator

- Primarily used in cooling climates
- Typically 70-80% efficient at energy recovery
- Advantages:
- May reduce cooling costs, reduces drafts
- Disadvantages:
- Highest first cost
- “Cost effectiveness” is hard to calculate

## (NuTech ERV photo)

## Balanced Supply and Exhaust Fans

- Uses a quiet exhaust fan and a supply fan
- Fan flows nominally equal to maintain balanced flow
- No heat exchange core
- Advantages:
- Lower cost way to get balanced flow
- Disadvantages:
- Higher first cost for two fans

## Integrated Heating/Cooling/Ventilation

- One unit provides all HVAC needs
- Canadian Advanced Integrated Mechanical System (AIMS) Project
- Advantages:
- Single unit, simpler ducting
- Disadvantages:
- First cost, lack of awareness and training

## Ventilation Equipment Selection

- Performance Testing and Certification
- Energy Star Ventilation Equipment
- Utility Promotion
- Codes and Standards

## Performance Testing and Certification

- Home Ventilating Institute
- Ventilation Industry Trade Association
- 95%+ of North American products
- Airflow and sound testing
- Certification program
- Certified Product Directory
- www.hvi.org
- 1-847-394-0150

## Energy Star Ventilation Equipment  

- Low energy and quiet fans
- Range Hoods max 4.0 sones, 2.8 cfm/w
- Bath fans <75 cfm  max 2.0 sones, 1.4 cfm/w
- Bath fans 75-200 cfm max 1.5 sones, 2.8 cfm/w
- Bath fans and IAQ exhaust fans this summer
- Supply fans, inline fans, multiport fans, ceiling fans, and air handlers in next year
- Website:  www.energystar.gov

## Utility Promotion

- Cash incentives for quiet, low energy fans
- $50-125 incentives for 1.5 sone max fans with efficacy of 2 cfm/watt or better
- Program incentives/requirements
- Seattle City Light Build Smart
- 1.0 sone max fans with 35 watts max draw
- Super Good Cents Manufactured Housing Program
- 1.0 sone max fans delivering 50 or 70 cfm

## Codes and Standards

- Washington State Ventilation and Indoor Air Quality Code (1991, updated 2000)
- 1.5 sone max fans or integrated systems operating for a minimum of eight hours a day
- 15 cfm/person plus .01 cfm/square foot; generally 50-125 cfm
- 50 cfm intermittent/20 cfm continuous bath fan
- 100 cfm intermittent/25 cfm continuous kitchen exhaust

## Codes and Standards (cont)

-  Minnesota Energy Code (1998)
- 1.0 sone max fans or integrated systems operating whenever the house is occupied
- 15 cfm/person for people ventilation, 0.05 cfm/square foot for total ventilation
- 1.5 sone max for remote fans and HRVs
- Stringent requirements to avoid backdrafting
- Must have operable windows or mechanical ventilation in bathrooms and kitchens

## Codes and Standards (cont)

- ASHRAE Standard 62.2 (June 2001 draft)
- 1.0 sone max fans or integrated systems operating continuously in most climates
- 1.5 sone max bath fans
- 1.5 sone max range hoods at 100 cfm/low speed
- International Residential Code (IRC) and International Building Code (IBC) (2000)
- 50 cfm intermittent/25 cfm continuous bath fan

## Don  Stevens

- Stevens and Associates
- PO Box 398
- Keyport, WA  98345
- 360-697-5414
- dstevens@telebyte.com