Articles & Insights
Filter Use on Fan Powered Terminal Units
Fan powered terminal units are designed to deliver reliable zone comfort without the need for terminal‑level filtration during normal building operation. Yet questions around filters continue to surface—most often during construction, when protecting equipment from dust and debris becomes a concern…
Ventilation Strategies: Chilled Beams vs. Chilled Water Fan Powered Terminal Units
A large portion of the energy exerted by an HVAC system comes from conditioning the outside air…
Ventilation Strategies: Controlling Fresh Air
The first goal when designing an HVAC system is occupant comfort. Comfort includes considering…
VAV Systems: How Air Flows Through the Equipment
The purpose of using a Variable Air Volume (VAV) system is to add controllability to a diversity of…
HVAC Ins & Outs with Dan Int-Hout - Area Factors and Free Area
Every so often, we get a request for the Ak, or area factors, or for the “Free Area” for our air…
VAV Control: Terminal Unit Sequence Affects the Entire HVAC System
Developing real estate requires millions of decisions about what the building will look like, how…
HVAC Ins & Outs with Dan Int-Hout - What is wrong with ADPI?
The Air Diffusion Performance Index (ADPI) was developed at Kansas State University in the 1960’s…
VAV Systems: Ground Control to Major Tom
Choosing the right equipment for your VAV system is critical, but it is only part of creating the…
HVAC Ins & Outs with Dan Int-Hout - Measuring Air Speeds
The 1962 Air Diffusion Council Test Code 1062 required that room airspeed measurements be taken…
VAV System Design: What is your style?
The Houston, Seattle, and Washington DC markets largely specify systems that utilize series fan-…
VAV Diffusers: The solution to some issues but the cause of others?
Over-cooling in the summer or over-heating in the winter can impact occupant comfort. There are…
VAV Equipment Selection: Fan Powered Terminal Units
In many VAV systems, the exterior zones will utilize fan-powered terminal units. When compared to a…
VAV Equipment Selection: Single Duct Terminal Units
Once the building cooling/heating load has been calculated and the VAV system has been laid out,…