Cal-Royal CR3300 Carpet Threshold Series with 3-Hr Positive Pressure Fire RatingThe Cal-Royal CR3300 Carpet Threshold Series is engineered for commercial door openings requiring a durable, code-compliant transition over carpet flooring. Built heavy duty for high-traffic commercial applications, this threshold series is Handicap Accessible and Barrier Free over carpet, carries a 3-Hr Positive Pressure fire rating, and meets UL 10B, UL 10C, and UBC 7-2 (1997) standards. Available in Aluminum and Dark Bronze finishes, the CR3300 Series delivers both compliance and long-term performance for demanding commercial door installations.Key FeaturesBarrier-Free Accessibility: Handicap Accessible, Barrier Free design over carpet ensures smooth, compliant transitions for ADA-oriented commercial doorways.Fire Protection Rating: 3-Hr Positive Pressure rating provides reliable performance in fire-rated door assemblies.Code Compliance: Meets UL 10B, UL 10C and UBC 7-2 (1997) standards for verified life-safety performance in commercial construction.Heavy-Duty Construction: Built for durability in high-traffic commercial door openings, supporting long-term reliable operation.Finish Options: Available in Aluminum and Dark Bronze finishes to coordinate with a range of commercial door and frame aesthetics.Fastener System: Supplied with #10 x 1-1/2″ wood screws; other screw types and anchors available upon request for varied substrate requirements.Finish-Matched Hardware: MIL finish thresholds include zinc plated screws, brass thresholds include brass screws, color anodized thresholds include matching plated screws, and stainless steel thresholds include stainless steel screws for consistent finish integrity.Non-Slip Option: Available with Sure Step Non-Slip Abrasive Coating for enhanced traction and slip-resistance in commercial traffic areas.Compatible Models: Available in CR3361 and CR33641 configurations, each with dedicated manufacturer installation instructions for accurate field installation.Certifications & Compliance3-Hr Positive Pressure Fire RatingUL 10B ListedUL 10C ListedUBC 7-2 (1997) CompliantHandicap Accessible / Barrier Free over carpetTechnical SpecificationsProduct Group: Door Trim and AccessoriesProduct Subgroup: Door ThresholdsProduct Type: Carpet and Tile DividersCommercial/Residential: CommercialProduct Model: CR3361, CR33641Product Category: Door Trim and AccessoriesDepartment: Door HardwareTypical ApplicationsCommercial Office BuildingsEducational FacilitiesHealthcare InstitutionsRetail EstablishmentsIndustrial and Warehouse FacilitiesMulti-Tenant Residential PropertiesGovernment and Municipal BuildingsWhy Cal-Royal CR3300?Cal-Royal CR3300 carpet thresholds deliver dependable, code-compliant performance backed by heavy-duty construction and recognized fire and accessibility standards including UL 10B, UL 10C, UBC 7-2 (1997), and 3-Hr Positive Pressure ratings. Engineered for demanding commercial door openings, the CR3300 Series provides a durable, barrier-free transition solution suited to high-traffic environments where compliance and long-term reliability are essential.