What We Do

Complete HVAC Design & Layouts

• Location of equipment and platform
• Attic access and catwalk
• Return grille and supply register locations
• Ductwork trunk and branch paths
• Required duct shafts
• Lighting locations
• Condenser locations

• Providing a working mechanical drawing
• Improving communications with other trade partners
• Having confidence each room will receive the proper duct size and air flow
• Paying exactly what it cost to do the job correctly.
• Production and Quality Installations.

Excellent Value Engineering

MJB will attend or host a value engineering meeting with:

• The architect
• The structural engineering team
• The framer, plumber and electrician
• The purpose of the meeting is to resolve any conflicts before the models are built

MJB is a member of Air Conditioning Contractors of America

The ACCA Process

ACCA Manual “J”Room by Room Load Calculations

The plans are painstakingly entered room by room into a computer program. Once all of the rooms are entered, the house is turned to the worst orientation to the sun. The computer will then list the precise amount of cooling btu’s and heating btu’s required by each room. It also gives the total required for the entire home.

ACCA Manual “S” Equipment Selection

Once the ACCA Manual “J” is complete the computer matches the equipment to the required load from Manual “J”. This insures the equipment sizing is correct.

ACCA Manual “D” Duct Sizing

The total equivalent length is determined of the worst case duct run on both the supply and return side of the furnace. A math formula using the TEL x airflow required by each room determines the size of the duct and register required.