This tender invites qualified and security-cleared contractors in Karachi to undertake the supply, installation, testing, and commissioning of a gas fire mechanical suppression system along with HVAC works for an 11 Kv substation. The project site is located near Karachi, requiring specialized knowledge of fire suppression technologies integrated with HVAC systems to ensure safety and operational efficiency in electrical substations. The scope includes handling advanced mechanical fire suppression equipment and HVAC installation tailored to the substation environment. Contractors must be prepared to manage engineering challenges such as confined spaces, electrical safety compliance, and coordination with existing infrastructure. The estimated project duration is 10 months, reflecting the complexity and scale of the work. Bidders should ensure they meet the PEC category requirements and maintain an active FBR/ATL status for the financial year 2025-26. It is advisable to verify the eligibility criteria carefully, including the submission of a Call Deposit Receipt (CDR) or Bank Guarantee valid for at least six months beyond the bid opening date. This ensures compliance with tender security protocols and avoids disqualification. Tender documents are available during working hours from Monday to Friday, with issuance closing one day before the bid opening. The submission deadline is on the 17th of February 2026, with the technical and financial bids opening at 1030 and 1100 hours respectively. Bids must be submitted in sealed envelopes to the office at Al-Noor Plaza, Khanna Dak Sohan, Near Expressway, Islamabad. Pro-Tip: Make sure to check the newspaper advertisement for specific stamp duty requirements and ensure the bid security envelope is clearly marked with the name of the work. Missing these details often leads to bid rejection.