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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