Philadelphia’s public teachers union is instructing members to work remotely Monday, setting up a showdown with the school district, which has instructed them to show up to begin preparing for in-person classes, but is no longer requiring it.

Philadelphia Federation of Teachers President Jerry Jordan told members Friday via email that they should ignore the School District of Philadelphia’s order to show up to class on Monday, as concerns continue over possible coronavirus infections. PFT spokeswoman Hillary Linardopoulos confirmed the email to NBC10 via phone call.

Jordan’s instructions follow the district’s decision to forge ahead with a mix of in-person and virtual classes for some 9,000 elementary school students starting Feb. 22. Teachers are required to begin showing up Feb. 8 to prepare.

However, the PFT has maintained that while it agrees that in-person instruction is best, it is not safe for members to begin teaching pupils in a face-to-face setting yet.

Dozens of educators are teaching outside of Southwark school to protests cities return to in person learning plan.

They say more needs to be done to keep teachers and students safe from Covid @NBCPhiladelphia pic.twitter.com/oTqUmSHfTS

— Miguel Martinez-Valle (@MiguelMValle) February 8, 2021

The union received support from City Council members Helen Gym, Kendra Brooks, Jamie Gauthier and Derek Green, as well as state representatives Rick Krajewski and Chris Rabb, who said they've received calls and emails from "angry and fearful" parents and teachers concerned about in-person schooling.

“It is the District’s responsibility to deliver a school re-opening plan supported by the children families and staff that the District serves. At this stage, it is clear this threshold has not been met," they said in a joint statement.

Philadelphia’s public schools have been fully virtual since March of last year, when coronavirus infections forced wide-ranging lockdowns across the state. Already, the district has tried multiple times to offer some form of in-person learning but has failed due to backlash from both teachers and parents.

Recently, concerns have been raised over the district's plan to use window fans to ventilate some classrooms that either have no ventilation system or a faulty one.

"Entire schools have maximum occupancy of zero according to air balancing reports. We have repeatedly asked for real, concrete solutions, and instead have been presented with a dangerous window-fan installation program that further jeopardizes the health and safety of our educators and young people," Jordan said in a statement Thursday. "This 'solution' is offensive, and it speaks volumes about the overall approach to reopening buildings at all costs."

Officials have maintained that it's paramount to return kids to school as they approach a full year in an all-virtual setting. They've cited studies showing that risk of viral spread is low in schools, especially for younger students, but have also acknowledged that infections would likely happen despite safety measures.

"COVID will come to our schools. It's not a matter of if; it's a matter of when," Gail Carter-Hamilton, Pediatric Resource Manager at the Philadelphia Department of Public Health, acknowledged last month as she joined Superintendent William Hite in announcing the latest plan for in-person schooling.

She noted, however, that since August of last year, only about 19 of roughly 200 charter or diocesan schools – which have been open since that time – have reported in-school spread of coronavirus.

Hite said district officials continue to advocate for teachers to get vaccinated, but there are thousands of people who are closer to the proverbial vaccination line. Waiting for all teachers to get vaccinated would jeopardize any possibility that in-person schooling would happen this year, Hite said.

Meanwhile, he added, teachers will have the option to opt out of in-person learning, but they must meet district-set criteria if they are to continue working from home.

A city spokesperson told NBC10 Sunday evening that the mediation process is still ongoing and that teachers won’t be mandated to report on Monday though any teacher who chooses to report is welcome to do so. 

“We remain hopeful that this process will ultimately allow both parties to come to a resolution in time for students to return the week of February 22,” the spokesperson said. 

“In addition to Deputy Mayor Lazer, Mayor Kenney has also been directly involved in the ongoing conversations—making contact with both parties to reinforce his desire for a resolution that allows students to return to the classroom on time. Additionally, the Administration has been in active discussions about the vaccination plan for teachers and other school staff and we hope to have an announcement on that in the near future.”