1. Ductless Heat Pumps Ventilation Gary Nordeen Bill Kingrey, P.E. 11/5/08 AFE Webinar

2. Introduction This presentation is an overview of ventilation requirements and methods for existing commercial buildings. This is not intended as a design guide, only to provide an overview of the issues related to ventilation in commercial buildings. ASHRAE 62.1 is the applicable standard.

3. How Much Ventilation Air? From International Mechanical Code (IMC) Chapter 11 or ASHRAE 62.1 15 CFM – 20 CFM per person depending on building occupancy Number of people assumed in any area is also given in the table

4. Ventilation Air System Alternatives Existing HVAC system Constant Volume Variable Air Volume Dedicated outside air system Hole in the wall AAHX module Open window(s)

5. Existing Building Ventilation Rates This presentation assumes that your existing building ventilation is adequate. If this is not the case, we suggest you hire a qualified specialist to review your outside air settings and occupancy assumptions. See notes page on this slide, for further details on existing VAV and Constant Volume systems

6. Hole in the Wall Ventilation For units with outside air connections Provide wall cap and a two-position damper motor Barometric damper not recommended Provide time clock, occupancy sensor or building control system connection to shut damper when not occupied Provide a single small fan with ductwork, filter and controls to serve multiple indoor units

7. Ventilation from an Air-to-Air-Heat Exchanger Recommended for 24-hour facilities Higher installation and maintenance cost, lower operating cost Connect to the building EMCS and set to provide air during working hours Install outlet(s) of AAHX near indoor unit(s) Install exhaust inlets in bathrooms or above copier and FAX machines

8. Open Window Ventilation Most codes allow you to use natural ventilation by opening the windows Operable window area must be at least 4% of the room area (IBC) Think about security issues

9. More Information Northwest Building Efficiency Center 866-929-6232 Info@nwBuildings.org www.nwBuildings.org