2005

ASHRAE 62 – 1989

BTLBuilding Tightness Limit

Based on LBL Correction factor

Gives agencies a minimum target CFM 50

Using the Zip Test Pro TI-86

BTLa

Building Tightness limits and ventilation requirements based on

ASHRA 62,119 & 136

Recommends Mechanical Continuous Ventilation

New fan standards

• Rated for Continuous use

• Sone level 1.0 or less certified by the home ventilation institute.

• Energy efficient 19 watt or less

Problem

• Contactors had a hard time finding the fans.

• Clients complained of fans running continuously.

• Agencies finding electricians to install fans.

Solutions

• Changed standards to allow intermittent fans instead of continuous.

• If BTLa called to add 50cfm fan.

• House had a existing fan in the bathroom, no other fan was needed.

Installation rate and Cost

• 30% of homes receive a new fan

• Cost ranges from $500.00 to $1000.00 per fan installed.

ASHRARE 62.2- 2010

• Measure air flow on all existing fans.

• Bathrooms must have 50cfm fans.

• Kitchens must have 100cfm fans.

• Or use a alternative compliance for existing homes. ( Over size your continuous fans to account for bathrooms and kitchens)

ASHRARE 62.2- 2010

• Run time instead of continuous.

• All fans must provide required flow at .25 w. g.

• Installation rate will increase to 90% of the home receiving fans.

• Depressurization tightness limits. (DTL)

OSHA Training

• OSHA Construction Industry regulations• Local agency providing training.• Local agency adjust training to WX• Local Community Colleges provide

training.• We are having problems with OSHA rules

contridicting Lead safe Practices such as plastic outside on the ground when raining or snowing. It gets slick & unsafe.