Press Alt + R to read the document text or Alt + P to download or print.
This document contains no pages.
HomeMy WebLinkAboutFLOOD VENT❑
816CS
8 x 16
105
205
❑
1220CS
12 x 20
235
500
❑
1232CS
12 x 32
305
645
❑
16i6CS
6 x i6
i8o
395
❑
624CS
16 x 24
310 -
670 y
0-1
1632CS
16 x 32
405
835 r
❑
2032CS
20 x 32
630
1240
❑
2424CS
2024 24
570
e'
1230
f-1
crc
%I W-14
Qm
i`
r
N C O R P
Crawlspace Dg?reens
nts
Crawlspace Louvers
Engineered FEMA Flood Vents
MODEL
Hxw
(in)
Net Area
On')
❑
MCS
8 x i6
105
❑
1220CS
12 x 20
235
❑
1232CS
12 x 32
305
❑
16i6CS
16 x i6
18o
❑
1624CS
16 x 24
kV
310
❑
632CS
16 x32
:405
❑
2032CS
20 x 32
630
©
2424CS
24 x 24
570
❑
2436CS
2036 36
850 _J-
Crawlspace Doors & Vents
Crawlspace Louvers/Screens
Standard Door/Air Vent
Great for new construction and remodeling.
One-piece doorplate with easy to insert vermin screen, fixed
louver and door lid. Made of durable PVC/ABS plastic (no rust
or rot) with a UV retardant treatment. Quick and easy to install.
3700 Shore Drive,
WHAT YOU'll-KH
-POWER
-1/4" MASONOIO
-PHILIPS HEAD':S;
-HAMMER'.
.
--'
-LEVEL
INCIODID 11 THE KIT
AISCREWS
B THREADED 0
C ANCHORS
(D)
�[C)
mount level
[frame]
Crawl Space
DomSystems
INCORPORATED
mounting holes
STEP 1.
. . . . . . . . . . . . . .
FRAME. INST-Ift,
drill top center hole.
BALANCE friii.- '.r.-arne (E) in place
INSERT OnEhi`rti
--k
SECUREtop.p.:00i T, qu p t center
s
LEVEL f . ...... 7.9les.
INSERT !re jTmg�qq ii!Q�pq gd.
.w
SECURE
. . . . . . . . . . . . .
R
STEP L: Slip I
PLACE lo6vif"J.151,4%.
SECURE.WAAffi
a n d n U t U):.�7
'tic
(OVER INS�T�E�
MW. . . . . . . . . . .
MARMIM®RM
,
PLACE cover"". fi
"
�*ggg-
@ STEP 1(louver)
STEP 1(corer)
SECURE on,,.,.,,' 0 MY!
OR
Q ONE
'�O t t
...........................
. . . . . . . . . . . . . . .. . ............................ ...........................................................................
. ......... 1�800-230-9598 , Fax 757-363-3405 - www.crawispacedoors.com info@uowlspatedoors.Eam
,2,rnn cL.— n,;.. i ni Virninin RAnrh. VA 7345S - (Iffirp M-W-0005 • Toll Free
b � �
Certification of Engineered Flood Openings
In accordance with NFIP, FEMA TB 1-08, and ASCE/SEI 24-05
I hereby certify that the Crawl Space Door Systems flood vents 816CS, 1220CS, 1232CS, 1616CS, 1624CS, 1632CS, 2032CS, 2424CS,
and 2436CS are designed in accordance with the requirements of the NFIP "Flood Insurance Manual' (2011) to provide automatic
equalization of hydrostatic flood forces by allowing for the entry and exit of floodwaters, when properly installed and sized as set
forth below. This certification follows the design requirements and specifications established in FEMA Technical Bulletin 1-08,
"Openings in Foundation Walls and Walls of Enclosures Below Elevated Buildings in Special Flood Hazard Areas", and the ASCE
Standard for "Flood Resistant Design and Construction" (ASCE/SEI 24-05).
Design Characteristics
Section 2.6.2.2 of ASCE 24 provides an equation to determine the required net area of engineered openings (A,) for a given enclosed
area (AJ. This equation is based on the hydraulic formula for the flow rate across sharp edged orifices. I have utilized this equation
to calculate 1) the respected flow rate through the individual openings between louvers; 2) the flow rate through the main frame
opening in case the louver is blown out during a flood event; and 3) the flow rate of water flowing through louver blades following
hydraulic short tube theory. The ultimate maximum total enclosed- area (A.) that can be serviced by a single vent has then been
determined by utilizing the lowest flow rate of the three assessed scenarios for each vent and is listed in Table 1.
These values are based on the following assumptions:
• in absence of reliable data, the rates of rise and fall have been
assumed with 5 feet/hour;
• The (maximum) difference between the exterior and interior
floodwater levels has been assumed with 1 foot during base
flood conditions,
• A factor of safety of 5 has been assumed, which is consistent
with design practices related to protection of life and property;
• ' The net area of openings (A.) as provided by the manufacturer.
2424C5
24 x 24
570
1230
Installation Requirements and Limitations 0
This certification will be voided if the following installation
requirements and limitations are not enforced: Table 1 Maximal total enclosed area (AJ that can be
• There shall be a minimum of two openings on different sides of served by each individual model based on the
each enclosed area; given net area of engineered openings (AJ
• The bottom of.each required opening shall be no more than 1ft
above the adjacent ground level;
• No temporary (e.g. during cold weather) or permanent solid cover may be placed into or over the flood vent that would block
the automatic entry or exit of floodwaters at any time;
• Where analysis indicates rates of rise and fall greater than 5 ft/hr, the total enclosed'area as given in Table 1 shall be reduced
accordingly to account for the higher rates of rise and fall.
Identification of the Building and Installed Flood Vents
The flood vent models marked in Table 1*) are being installed at the following building:
Building Address
Certifying Design Professional
Name Christopher Mark Loney
Title Mechanical Engineer
Address 1675 Meredith Road, Virginia Beach, VA 23455
Type of License Professional Engineer
License # 0402029000 Signature
CHRISTOPHER K LONEY
No.028000
Issuing State Virginia
Certification of Engineered Flood Openings
In accordance with NF1P, FE`MA TB 1-08, and ASCE%SEI 24-.05
I hereby certify that the Crawl Space Door Systems flood vents 816CS, 1220CS, 1232CS, 1616CS;1624CS, 1632CS, 2032CS, 2424C$,
and 2436CS are designed in accordance with the requirements of the NFIP "Flood Insurance Manual' (2011) to provide automatic
equalization of hydrostatic flood forces by allowing for the entry and exit of floodwaters, when properly installed and sized as set
forth below, This certification follows the design requirements and specifications established in FEMA Technical Bulletin 1-08,
"Openings in Foundation Walls and Walls of Enclosures Below Elevated Buildings in Special Flood Hazard.Areas", and the ASCE
Standard for "Flood Resistant Design and Construction" (ASCE/SEI 24-05). The actual vent opening measurements were determined
and certified by Mr. Christopher Mark Loney, Virginia PE No. 029000. Calculations are .based on the spreadsheet formulas, and
"Review of certification of Engineered Flood Openings, dated January 16, 2012" prepared. by Dr. Georg Reichard, Associate Professor
of Building Construction, Virginia Tech.
Design Characteristics
Section 2.6.2.2 of ASCE 24 provides, an equation to determine the required. net area of engineered openings (A.) for a given enclosed
area (AL). This equation is based on the hydraulic formula for the flow rate across sharp edged orifices. I have utilized this equation
to calculate 1) the respected flow rate through.the individual openings between louvers; 2) the flow rate through the main frame
opening in case the louver is blown out during a flood event; and 3) the flow rate of water flowing through louver blades following
hydraulic short tube theory. The ultimate maximum total enclosed area (A.) that. can be serviced by a single vent has then been
determined by utilizing the lowest flow rate of the three assessed scenarios for each vent and is listed in Table .1.
These values are based on the following assumptions:
• In absence of reliable data, the rates of rise and fall have been
assumed with 5 feet/hour;
• The (maximum) difference between the exterior and interior
floodwater levels has been assumed with 1 foot during base
flood, conditions;
• A factor of safety of 5 has been assumed, which is consistent
with design practices related to protection of life and property;
• The net area of openings (AJ as provided by the manufacturer.
Installation Requirements and Limitations
This certification will be voided if the following installation
requirements and limitations are not enforced:
• There shall be a minimum of two openings on different sides of Table 1 Maximum total enclosed area (Ae) that can be
each enclosed area; served by each individual model based on the
• The bottom of each required opening shall be no more than 1ft given net area of engineered openings (A.)
above the adjacent ground level;
• No temporary (e.g. during cold -weather) or permanent solid cover may be placed into or over the flood vent that would block
the automatic entry or exit of floodwaters at anytime;
• Where analysis indicates rates of rise and fall greater than 5 ft/hr, the total enclosed area -as given in Table 1 shall be reduced
accordingly to account for the higher rates of rise and fall.
1
Model
H x W
[in]
Ao
(in,]
Ae
Ift'l
❑
816CS
8 x 16
106
205
❑
1220CS
12 x 20
237
500
0
1232CS
12 x 32
3.06
645
❑
1616CS
16 x 16
184
395
❑
1624CS
16 x 24
312
670
CI
1632CS
16 x 32
408
835
❑
2032-CS
20 x 32
630
1240.
❑
2424CS
24 x 24
570
1230
❑
2436CS
24 x 36
852
1765
Certifying Design Professional •���� �� �����_
Name, Title Steve A. Geci, President, Geci & Associates Engineers, Inc. {? /0
Address 2950 N 12"h Avenue, Pensacola, FL 32503 �m G3 e� EM�SO..
LicenseEngineer, •
Florida Professional Lice, se, o. 33658 NO.33658 :*
Signature � * •
t?6�2STAT8 OF+
7
L *;rW�-OU. -
Identification of the Building and Installed Flood Vents '(By Others)
The flood vent models marked in Table 1*) are being installed at the following building:
Building Address