
MicrofastHP®QUICK
RESPONSE HORIZONTAL
SIDEWALL HIGH PRESSURE
SPRINKLER VK344 (K2.8)
TECHNICAL DATA
Page 4 of 6
Form No. F_080688 21.03.05 Rev 21.1
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
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Approval Chart 1 (UL)
MicrofastHP® Quick Response Horizontal Sidewall HP Sprinkler VK344
for light hazard occupancies only
deflector must be located 4” to 6” (102 mm to 152 mm) below the ceiling.
Base Part
Number1SIN Maximum
Pressure
Thread Size Nominal K-Factor Overall Length Listings and Approvals3
(Refer also to Design Criteria below.)
NPT BSPT U.S. metric2Inches mm cULus4LPCB
209957VK344 250 psi 1/2” 15 mm 2.8 40.3 2-11/16 68 A1Y, B1X, C2Y, D2Z -- -- --
Approved Temperature Ratings
A - 135 °F (57 °C), 155 °F (68 °C), 175 °F (79 °C),
200 °F (93 °C), and 286 °F (141 °C)
B - 135 °F (57 °C), 155 °F (68 °C), 175 °F (79 °C),
and 200 °F (93 °C)
C - 155 °F (68 °C), 175 °F (79 °C), 200 °F (93 °C),
and 286 °F (141 °C)
D - 155 °F (68 °C), 175 °F (79 °C), and 200 °F
(93 °C)
Approved Finishes
1 - Brass, Chrome, White
Polyester5,6, and Black Polyes-
ter5,6, and PTFE5
2 - ENT5
Approved Escutcheons
X - Installed with standard surface-mounted escutcheons or re-
cessed with the Viking Micromatic®Model E-1, E-2, E-3, or G-1
Recessed Escutcheon
Y - Installed with standard surface-mounted escutcheons
Z - Installed with standard surface-mounted escutcheons or
recessed with the Viking Micromatic®Model E-1 Recessed
Escutcheon
Footnotes
1 Base part number shown. For complete part number, refer to Viking’s current price schedule.
2 Metric K-factor measurement shown is when pressure is measured in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
3 This table shows the listings and approvals available at the time of printing. Other approvals may be in process.
4 Listed by Underwriters Laboratories Inc. for use in the U.S. and Canada.
5 cULus Listed as corrosion-resistant.
6Other colors are available on request with the same Listings and Approvals as the standard colors.
7Listings are limited to Light Hazard Occupancies, with hydraulically calculated wet systems. exception: 4.2K sprinklers may be installed on hydrauli-
cally calculated dry pipe systems where piping is corrosion resistant or internally galvanized
DESIGN CRITERIA - UL
(Also refer to Approval Chart 1 above.)
cULus Listing Requirements:
Viking MicrofastHP® Quick Response Horizontal Sidewall Sprinkler VK344 is cULus Listed as indicated in the Approval Chart for installation in accor-
dance with the latest edition of NFPA 13 for sidewall standard spray sprinklers.
• Limited to Light Hazard occupancies only (Small orifice sprinklers are limited to Light Hazard where allowed by the installation standards being
applied, with hydraulically calculated wet systems only.)
• Protection areas and maximum spacing shall be in accordance with the tables provided in NFPA 13. Minimum spacing allowed is 6 ft. (1.8 m).
• Locate the deflector 4” to 6” (102 mm to 152 mm) below the ceiling. Align with the leading edge of the deflector parallel to the ceiling.
• Maximum distance from end walls shall be no more than one-half of the allowable distance between sprinklers. The distance shall be measured
perpendicular to the wall. Minimum distance from end walls is 4 in. (102 mm).
• The sprinkler installation and obstruction rules contained in NFPA 13 for sidewall standard spray sprinklers must be followed.
IMPORTANT: Always refer to Bulletin Form No. F_091699 - Care and Handling of Sprinklers. Also refer to Form F_080614 for general care,
installation, and maintenance information. Viking sprinklers are to be installed in accordance with the latest edition of Viking technical data,
the appropriate standards of NFPA, LPCB, APSAD, VdS or other similar organizations, and also with the provisions of governmental codes,
ordinances, and standards, whenever applicable.