| Date |
Text |
| 2018-10-24 14:31:55 | CHANGE RESULT TO PASS, DESIGNER WILL REMOVE NOTE, |
| | RETURNS DUCTED TO PLENUM. |
| 2018-10-16 15:22:28 | 2ND REVIEW: FBC 2017 6TH ED. RESIDENTIAL |
| | |
| | PLEASE DEMONSTRATE COMPLINACE WITH M1602.3 BALANCED |
| | RETURN AIR. NOTE 19 ON SHEET M-2 INDICATES RETURN DUCTS |
| | TO BE 1.5 X SUPPLY TO BEDROOMS. THE PLANS DO NOT |
| | INDICATE THIS. |
| | |
| | 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 11/2 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 UNDERCUT TO ACHIEVE PROPER RETURN |
| | AIR BALANCE. |
| | |
| | 2.TRANSFER GRILLES SHALL USE 50 SQUARE INCHES (OF |
| | GRILLE AREA) TO 100 CFM (OF SUPPLY AIR) FOR SIZING |
| | THROUGHTHE-WALL TRANSFER GRILLES AND USING AN |
| | UNRESTRICTED 1- INCH 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. |
| | |
| | |
| | STEVEN KENNEDY, CBO |
| | ASSISTANT BUILDING OFFICIAL |
| | (561) 805-6710 |
| | [email protected] |
| | |
| | |
| | |
