Manual-S is being required by many building programs and local codes these days. The problem is, it’s really hard to tell whether the installing contractor actually followed the guidelines or not. It’s not that it’s impossible to confirm. It just takes a good deal of time, as well as a solid understanding of the HVAC [...]
Starting today, any residential building code official can obtain access to our Duct and Envelope Tightness Verifier training for FREE. This training covers the building science basics of envelope and duct leakage testing, contains straight-forward how-to videos illustrating the proper use of testing tools (both Retrotec and Energy Conservatory brands), and includes a simple report [...]
The available static pressure of your blower plays a huge role in making sure the HVAC system is able to perform optimally. After performing the Manual-J calculation, you know how many btu’s of energy will be required to keep each room of your home comfortable. This total btu requirement, or “load,” is used to select [...]
Friction Rate The friction rate tells us how much friction our ductwork should produce, per 100’, so that we consume the rest of our available static pressure (ASP) budget with our specific layout. The idea here is that we’re working backwards so that we can land on our selected ASP when all is said and [...]
One of the most common downfalls of installed HVAC systems is their inability to distribute the correct amount of air to where it’s needed most. When systems are restrictive, or blowers aren’t powerful enough, the air simply doesn’t make it to where it needs to go. This issue commonly manifests in the form of comfort [...]
Manual-D is ACCA’s duct design method for properly sizing the airflow pathways – the ductwork – within a residential heating and cooling system. Even though this method has been around for many years, it is rarely implemented (and even less-often implemented correctly). Manual-D and Duct Calculators Frequently, it is assumed that the use of a [...]
Here’s how to satisfy ASHRAE 62.2 when using a supply-only system. The following are two examples of how to set things up, depending on what you’re trying to achieve and where you are in the installation process. You know how often you want the system to run per hour, but you’re not sure what size [...]
Manual-J’s Required. 29 states have adopted codes equivalent to the 2009 or 2012 International Energy Conservation Codes (IECC). As a result, 29 states require Manual-J load calculations* be performed to properly calculate heating and cooling loads for new residential construction (See Section 403.6 of 2009 IECC and Section 1401.3 of 2009 IRC). With Home Energy [...]
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