HomeMy WebLinkAboutCERTIFICATION ON ENGINEERED OPENINGS:i
Certification of Engineered Flood Openings
rOUMIAT1011 L Dart W-S In accordance with NFIP, FENW Technical Bulletin 9-08 and ASCEISEI 24-05
Certification Statement
I hereby certify that the flood vents manufactured by USA Foundation Flood Air Vents (Mode) No's FO-316, FA 316. FOAL, FAAL, RFPC and RFSS) are designed
in accordance with the requirements of the 2011 NFIP "Flood Insurance Manual" to provide automatic equaC¢ation of hydrostatic flood loads on exterior walls by
allowing the automatic entry and exit of floodwaters during floods up to and including the base 100-year flood. The flood vents must be installed and a ed property
asset forth by the requirements below. This certification follows the design requirements and specifications that are established in FEMA Technical Bulletin 1-08
and ASCEISEI 24-05.
Design Characteristics
I hereby certify that 1 have measured the flood vent models fisted below_ 1 have also calculated the maximum total enclosed area that can be served by each
individual model based on the net area of the opening using the equation taken from ASCElSl7 24-05. Section 2.6.2-2 and the following design assumptions fisted
below.
Design Assumptions: Area of Engineered Openings perASCE 24, Section 2.622
1. The rates t rise and fall have been assumed A, _ (0.0333)[1/c]R(A.) _> Ae =Ao! (0.0333)[1/c]R]
to be 5 feet per hour_ [
2- The maximum difference beh%-een the exterior Where:
and Interior floodwater levels have been A. = Total Net Area of Openings Required (in')
assumed to be 1 foot during base flood
condifions. 0.033 = Coefficient Corresponding to a Factor of Safety of 5.0 (nz hrht)
3- A factor of safety of 5 has been used in the c = Opening Coefficient (Non -Dimensional; see ASCE 24. Table 2 2)
design. R = Worst Case Rate of Rise and Fall (ftlhr)
A" = Total Enclosed Area (ftZ)
Maximum Area Coverage in Square
Feet per Vent for each Model
Model
Height
Width
A.
Constant
C
(in.)
(in-)
(in 2)
(inZ•hr/fta)
R
An
Ft1�16
7.00
15.50
108.50
0.0330
OA00
(ftlllr)
tom)
FA-316
7:OD•- ,: -
15.50.
108.50
0.0330
-
5
2Z
FOAL-W
7.DD. -:.
1550:
108.50
0.0330
: ,0.400
0.400
5
263
FOAL43
7.00
A5.50 _
106550
0.0330
:
OA00
5
263
FOAL-G
7 04
15 50 .
108:5Q
0.0330
D.400
5
'
263
FAAL-W
7.00
15 5U
108.50
5
263
FA 43
7 00
0.0330
0.400
5..
263
15.50 ;:108.50 0.0330 •� ``0.400
FAAL-G :Z00: 15.50 5 263
I08.SU 0a1330 0.400 5 263
RFPC 7.00 13.75 96.25 13.7$ 0,0330 0398
RFSS 7.00 96.25 0.0330 0.398 .5 5 232
'Note: (A") is the maldmum total enclosed area Neat can be served f ireach individual model based on the net area of thepening lA
o 232
")
Limitations and Installation Requirements 7hrs certdreatron wrU be yarded rn rt's entirety if the fottowfrtg installation requirements andlimftations are not enforced_ 115A Foundation Flood AirVenfs and Cann
Engineering Consultants, Inc. do not recommend or authorize any modrrcations to the Hood vents artd will not be held Gable far improper installation or modGcalion of the
flood vents.
FEMA/ NFIP Limitations and Installation Requiretnents:
1. A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be Provided.
2. The bottom of all openings shall be no higher than one foot above grade that is immediately under each opening.
3. Openings may be equipped with screens, louvers, valves or other coverings or devices provided that they permit the automatic entry and exit or floodwaters.
4, It is recommended that openings be reasonably distributed around the perimeter of the enclosed area unless there Is clear just�cafion for putting all openings
on just one ortwo sides (such as in townhouses or buildings set into sloping sites).
5. Where analysis indicates fates of rise and fall greater than 5 feet per hour, the total enclosed area shall be reduced accordingly_
! Title: SAMPLE
i5= SAMPLE
Type: SAMPLE
SAMPLE
a Number SAMPLE
and Installation Address:
SAMPLE
Number. SAMPLE
um total enclosed area that can be served for EACH individual vent
232 Square Feet
Engineering Seal
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uTtltcyd E�B�i�e�J trtrap� e u w rANY-
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-s
FA-3376 & FAA
FOAL 81 FO-376
a
56
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