Nassau County is providing tax incentives to a Port Washington manufacturer of fire doors that had considered moving production work to Pennsylvania, officials said.

In return for the aid, Long Island Fireproof Door Inc., also known as L.I.F. Industries Inc., has promised to add 18 jobs to its payroll of more than 300 over three years.

The company had explored shifting some factory work to Pennsylvania to reduce costs, L.I.F. attorney William Cornachio said Thursday.

“The company faced a choice to expand manufacturing in Port Washington or to expand and move manufacturing jobs to Pennsylvania,” he said. “The company has committed to maintaining jobs and adding jobs in Nassau County for 15 years.”

L.I.F. will receive property tax breaks on three buildings for between 10 years and 15 years.

The largest break is on 10 Harbor Park Dr., which the company plans to purchase. The tax rate on that facility will be frozen for 10 years and then rise by .73 percent in each of the following five years, according to the county’s Industrial Development Agency. L.I.F. also will receive $35,000 off the mortgage recording tax on the 40,000-square-foot structure.

The property tax rates that L.I.F. pays on 5 Harbor Park Dr. and 18 Industrial Park Dr. will be frozen for three years and then increase .73 percent in each of the next seven years.

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The IDA also granted the company up to $40,000 off sales tax on the purchase of construction materials and equipment for improvements to the buildings.

“We are very happy that they are going to stay here,” IDA executive director Joseph J. Kearney said last month of the family-owned business.

Records show that employees earn, on average, $58,355 per year, excluding medical and retirement benefits.

New York State is also helping L.I.F.

In March, Empire State Development agreed to provide up to $500,000 in state tax credits. And in December 2015, the state Power Authority awarded 290 kilowatts of low-cost electricity over seven years.

L.I.F. began on Long Island in the early 1930s as Long Island Kalamein Door Co. It was purchased in 1966 by Vincent and Joseph Gallo.

Under the Gallos’ leadership, the company increased its annual sales from $75,000 to more than $50 million. It also sells wooden doors, door frames and architectural finish hardware.

L.I.F.’s products can be found at 7 World Trade Center in Manhattan, Terminal 4 at JFK Airport and Trump International Hotel & Tower in Chicago.