"that were installed in" is correct and can be used in written English.
Example sentence: The new security cameras that were installed in the parking lot have deterred theft.
Remember all those apricot and avocado bathrooms that were installed in the 1980s?
His grandfather delivered the steps that were installed in front of the university's chapel.
Stormwater runoff was collected from drainage points that were installed in each area.
The plans call for removing dropped ceilings in the lobby that were installed in the 1950s, he said.
The reactor was aerated by means of bundles of gas-permeable hollow-fiber membranes that were installed in the reactor.
"There are air conditioning units that were installed in the 1960's, but half of them don't work," Mr. DeVivo said.
Aquabyte works with manufacturers to create camera systems that are installed in the fish pens.
Personal Video Station works with a TV tuner card that is installed in the computer.
The more hardware that's installed in the body, the greater the risk to the patient.
Line 14 is a 24-inch diameter pipe that was installed in 1998, making it a relatively new line.
For the Federal Aviation Agency, Pei designed a type of pentagonal control tower that was installed in many American airports.
