| Date |
Text |
| 2020-03-30 14:44:02 | PLAN |
| | REVIEW COMMENTS |
| | |
| | 1ST REVIEW: FBC SIXTH EDITION (2017) |
| | ROBERT MCDOUGAL, CBO |
| | COMMERCIAL COMBINATION PLANS EXAMINER |
| | (561) 805-6714 |
| | [email protected] |
| | |
| | DENIED BY MECHANICAL |
| | PLEASE ADDRESS THE ITEMS NOTED BELOW: |
| | |
| | 1) FBC-R - M 1602.4 PROVIDE BALANCED AIR RETURN AT |
| | BEDROOMS. M1602.4 BALANCED RETURN AIR. |
| | RESTRICTED RETURN AIR OCCURS IN BUILDINGS WHEN RETURNS |
| | ARE LOCATED IN CENTRAL ZONES AND CLOSED INTERIOR DOORS |
| | IMPEDE AIR FLOW TO THE RETURN GRILL OR WHEN CEILING |
| | SPACES ARE USED AS RETURN PLENUMS AND FIRE WALLS |
| | RESTRICT AIR MOVEMENT FROM ONE PORTION OF THE RETURN |
| | PLENUM TO ANOTHER. PROVISIONS SHALL BE MADE IN BOTH |
| | RESIDENTIAL AND COMMERCIAL BUILDINGS TO AVOID |
| | UNBALANCED AIR FLOWS AND PRESSURE DIFFERENTIALS CAUSED |
| | BY RESTRICTED RETURN AIR. PRESSURE DIFFERENTIALS ACROSS |
| | CLOSED DOORS WHERE RETURNS ARE CENTRALLY LOCATED SHALL |
| | BE LIMITED TO 0.01 INCH WC (2.5 PASCALS) OR LESS. |
| | PRESSURE DIFFERENTIALS ACROSS FIRE WALLS IN CEILING |
| | SPACE PLENUMS SHALL BE LIMITED TO 0.01 INCH WC (2.5 |
| | PASCALS) BY PROVIDING AIR DUCT PATHWAYS OR AIR TRANSFER |
| | PATHWAYS FROM THE HIGH PRESSURE ZONE TO THE LOW ZONE. |
| | EXCEPTIONS: |
| | - 1. TRANSFER DUCTS MAY ACHIEVE THIS BY INCREASING THE |
| | RETURN TRANSFER 1-1/2 TIMES THE CROSS SECTIONAL AREA |
| | (SQUARE INCHES) OF THE SUPPLY DUCT ENTERING THE ROOM OR |
| | SPACE IT IS SERVING AND THE DOOR HAVING AT LEAST AN |
| | UNRESTRICTED 1 INCH (25 MM) UNDERCUT TO ACHIEVE PROPER |
| | RETURN AIR BALANCE. |
| | |
| | - 2. TRANSFER GRILLES SHALL USE 50 SQUARE INCHES (32 |
| | 258 MM2) (OF GRILLE AREA) TO 100 CFM (OF SUPPLY AIR) |
| | FOR SIZING THROUGH-THE-WALL TRANSFER GRILLES AND USING |
| | AN UNRESTRICTED 1-INCH (25 MM) UNDERCUTTING OF DOORS TO |
| | ACHIEVE PROPER RETURN AIR BALANCE. |
| | |
| | - 3. HABITABLE ROOMS ONLY SHALL BE REQUIRED TO MEET |
| | THESE REQUIREMENTS FOR PROPER BALANCED RETURN AIR |
| | EXCLUDING BATHROOMS, CLOSETS, STORAGE ROOMS AND LAUNDRY |
| | ROOMS, EXCEPT THAT ALL SUPPLY AIR INTO THE MASTER SUITE |
| | SHALL BE INCLUDED. |
| | |
| | 2) SPECIFY THE SIZE OF THE DUCTS FROM THE AHU ALL THE |
| | WAY TO THE 10" DUCT SUPPLYING THE NEW ADDITION. FBC |
| | 107.3.5.1.4 |
| | |
| | |
| | |
