D199

Two categories of ovens in compliance to ASTM D 5243 Type 200 air changes per hour

Method 1: Based on Flow Meter Measurement

The equipment is fitted with a Rotameter

Method 2: Air Velocity Method

Fresh air is admitted by the high capacity blower and controlled by means of a damper

In this method, an air blow has an air velocity tunnel equipped with a differential air velocity measurement probe is connected to the oven.