REST API Endpoint error

I am using REST API with SharePoint 2013 and I want to know if the following url endpoint is legal or if there is a better way?

 //http://myspsite.com/nrm/_api/web/lists/getbyTitle('My_Project_Modules')/items?$select=DIR,Station,Title,Building_x0020_Number&$filter=Project_x0020_Number eq '402-CSI-001'     //<---  Works when I paste it in the browser
 var projNum = '402-CSI-001';
var endPointUrl = _spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/getbyTitle('My_Project_Modules')/items?$select=DIR,Station,Title,Building_x0020_Number&$filter=Project_x0020_Number eq "+projNum;  //<---  Not valid when I run it in my code

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Error I get in my js file

js file

function loadSPItems() {
var projNum = '402-CSI-001';
var endPointUrl = _spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/getbyTitle('My_Project_Modules')/items?$select=VISN,Station,Title,Building_x0020_Number&$filter=Project_x0020_Number eq "+projNum;//,ProjectNumber,ApprovalStatus,ProjectExecutionStatus”;
var headers = { 
	"accept": "application/json;odata=verbose" 
}
 
jQuery.ajax({ 
	url: endPointUrl, 
	type: "GET", 
	headers: headers, 
success: function (data) {
	console.dir(data);
}, 
	error: function (err) { 
	alert("Error Occured:" + JSON.stringify(err)); 
}
 
});
 
}

loadSPItems();

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Thoughts?