HomeMy WebLinkAboutFLOOD VENT SPECIFICATIONSEl
MCS
8xi6
105
205
El
1220CS
12X20
235
500
0
1232CS
12 X32
305
645
El
A6CS
16 m6
180
395
El
1624CS
16 X24
310
670
632CS
16x32
405
835
El
2032CS
20 X32
630
1240
El
242
24X24
570
1230
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Crawlspace D Ws- "Wants
Crawlspace Louvers/Screens
Engineered FEMA Flood Vents
r—MODEL
HxW
(in)
Net Area
(In2)
El
816CS
8 X16
105
El
1220CS
12 X20
235
El
1232CS
12 X32
305
❑
iMCS
16 x16
180*
El
1624CS
16 X24
310
❑
1632CS
16 X32
405
El
2032CS
20 X32
630--:
El
2424CS
2024
570
❑
2436CS
2036
850
Crawlspace Doors & Vents
Crawlspace LouversIScreens
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, Suite 101
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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). 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 (Ae). 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.
2424CS
24 x 24
570
1230
Installation Requirements and Limitations.
El
This certification will be voided if the following installation
requirements and limitations are not enforced: Table i Maximum total enclosed area (Q 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 (Q
• 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.
Professional
Name, Title Steve A. Geci, President, Geci & Associates Engineers, Inc.
Address .2950 N 12th Avenue, Pensacola, FL 3803
License Florida Professional Engineer, Lice se o. 33658
Signature
e-
No. 3W58
• STATE OF
Identification of the Building and Installed Flood'Vents (By Others)-'/jjruNAL � %-
The flood vent models marked in Table 1*) are being installed at the following building:
Building Address p